Chapter Text
Kamino ward.
A place that used to be filled with businesses and inhabitants, was now almost completely reduced to rubble as two Symbols clashed in the sky.
All Might, the Symbol of Peace.
All For One, the Symbol of Evil.
There fists collided together in a powerful shockwave that pushed through the debris and rubble of kamino ward, helicopters that flew overhead to capture the fight were forced to back up from the sheer force of the blows both Symbols were trading.
All around the city… the world watched the two Symbols battle.
On one of those huge outdoor display screen in the center of Yokohama, the onset typically used for promotion of a product or the news, was tuned into the news and being shown was the entire fight between All Might and All For One.
A massive crowd had gathered to watch there number 1 hero battle this unknown villain, among the massive crowd, were 5 figured that were staring up at the screen, their faces etched with devastation, as All Might get's punched down toward the ground.
Izuku Midoriya, Tenya Iida, Shoto Todoroki, Momo Yaoyorozu, Eijiro Kirishima.
And just a few feet behind the five, Bakugo Katsuki stood, his fists and teeth clenched at he stared up at the display, like it had personally killed a loved one and deserved to be murdered.
On the screen All For One's arm began to bulge, and in milliseconds, All For One's right arm morphed into a grotesque amalgamation of spear-like bones, muscles incredibly swollen that it almost looks like there going to explode, kinetic boosters that hummed loudly with energy almost as if his arm had its own reactor inside it.
"Th-that arm… is-" Midoriya choked, his hands shaking as he clenched the side of his pants, his eyes locked onto the screen like he was afraid looking away would make it more real than it already was.
Midoriya's words barely made it out before the screen above them flared with another impact, and the entire image of Kamino Ward warped from the sheer force of the collision, as if reality itself was struggling to keep up with what it was showing.
On screen, All For One's arm didn't just exist anymore—it declared itself, expanding and twisting into something that looked less like flesh and more like a manufactured disaster, every inch layered with stolen power that hummed like an engine refusing to die.
Beside Midoriya, Iida adjusted his glasses out of pure habit rather than necessity, his body visible rigid, like he was trying to physically impose order onto something that had none.
"The power of that villain's quirk is… unprecedented," Iida said sharply, though he couldn't hide the strain in his voice. "No single human body should be capable of that much power at once!"
Bakugo clenched his teeth loudly behind them, eyes locked onto the screen with a kind of furious focus that made it clear he wasn't just watching—he was measuring, like he was already planning how to blow through something similar.
"Tch… doesn't matter what this fucker's gimik is." Bakugo muttered, though the way his fingers twitched betrayed the tension in his arms, "id he's got an arm, it still breaks."
On screen, All Might surged forward again, but the moment his fists met All For One's altered limb, the air detonated outward in a violent shockwave that swallowed nearby structured whole, the camera feed briefly distorting into static as helicopters struggled to maintain distance.
Momo's hands instinctively came together at her chest, her mind already racing through contingency plans that all ended at the same conclusion: there were no clean solutions here.
"This isn't just brute force anymore…" she said quietly, almost to herself, "it's adaptation. He's fighting like he's already predicted every possible counterattack."
Todoroki's gaze narrowed slightly, his expression colder than usual (which is saying something) but not detached—focused in a way that meant he was actually afraid of what he was seeing, even if he would never say it out loud.
"He's not predicting," Todoroki said flatly, "He's overwhelming."
Kirishima swallowed, his jaw tight as he watched All Might get forced back for a split second, the Symbol of Peace actually sliding across the rubble from the impact instead of standing firm.
"That's… that's All Might, man," Kirishima said, voice lower now, less certain than he wanted to sound, "He's actually getting pushed back…"
The crowd around them erupted into noise—gasps, screams, prayers, arguments—but it all blurred into one unified sound of disbelief as All For One's arm shifted again, the bone-like structures along it realigning as if the attack itself was thinking.
Then the ground beneath the screen lit up with another blast.
A delayed shockwave rolled through Kamino Ward, and for a brief moment the feed showed All Might buried in debris, smoke curling around his silhouette as if the city itself was trying to swallow him whole.
And that was when Bakugo snapped.
"He's still standing," Bakugo growled, voice low and sharp enough to cut through the noise around them, "That old man's still standing, isn't he?"
No one answered immediately.
Not because they didn't know.
But because watching it happen didn't feel like proof anymore—it felt like witnessing something that shouldn't have been surviving in the first place.
And deep in the wreckage on screen, as dust began to settle, All Might slowly pushed himself up again.
Not with ease.
Not with grace.
But with the stubborn, unbreakable force of something that refused to let the world end here.
And above him, All For One's voice echoed through the ruined city—calm, amused, and completely certain this was going exacly as planned.
Spoiler for All For One…
It wasn't going as he planned.
All For One lifted his grouteque arm and rushed downward, intending to flatten the Symbol of Peace and end this fight right here, right now.
That was until a bright rainbow glow appeared in between All Might and All For One.
And before anyone knew it…
A massive blast of rainbow light erupted from Kamino Ward, the blast reached the edges of the city as every person caught in the radius was blinded in a flash of rainbow light.
And because of this temporary blindness, none of them saw the seven colorful emeralds that shot out of the center of the rainbow blast and were sent flying in random directions.
The world didn't come back all at once.
It returned in fragments—sound before sight, pressure before clarity—as the ringing in everyone's ears slowly gave way to the distant crackle of burning debris and the low, terrified murmur of thousands of people trying to process what they had just witnessed, while Kamino Ward itself seemed to hold its breath like the aftermath of the blast hadn't decided whether it was finished yet.
On the broken battlefield where All Might and All For One stood, the smoke parted just enough to reveal something that absolutely, undeniably was not there before.
Because right there—directly between them—was a man.
A man in a red coat with a massive, exaggerated mustache, goggled resting on his forehead, and an expression that sat somewhere between irritation and absolute confusion, like reality itself had personally offended him.
And beside him hovered a machine.
Sleek, egg-shaped, metallic, humming softly with technology so advanced it made even Support Course prototypes look like children's toys.
Dr. Eggman blinked once.
Then twice.
Then very slowly turned his head to the left, staring at the ruined city with narrowed eyes as his mustache twitched in visible annoyance, his brain already trying to process variables that refused to make sense.
"…This is not the experiment room."
He turned to the right.
"…Or my empire."
Then his gaze lifted.
And locked directly onto two of the most dangerous being on the planet mid-battle.
There was a pause.
A long, uncomfortable pause.
"…And i have no idea where the hell i am."
Across from him, All Might's instincts fired instantly despite the exhaustion tearing through his body, his posture shifting just enough to place himself slightly in front of the stranger as if by reflex alone, because whatever this was—whoever this was—they were not supposed to be here.
"Get back" All Might barked, his voice carrying that same overwhelming authority even in his weakened state, even as dust clung to his frame and blood ran down his side.
"This area isn't safe for civilians!"
Eggman stared at him.
Slowly.
Unimpressed.
Then glancing behind himself at his hovering Eggmobile like it personally offended him that someone would even suggest he needed saving, his gloved hand rising to adjust his coat with deliberate, almost theatrical calm.
"…Civilian?"
Eggman's single word didn't just hand in the air—it challenged it, like reality itself had just been corrected by someone who refused to acknowledge the rules everyone else was desperately clinging to.
All Might blinked once, clearly not expecting that kind of response rom someone he had just tried to save, his already strained body tightening as instinct warred with confusion, because everything about this man—from the way he stood to the machine hovering beside him—screamed that he was anything but a helpless civilian caught in the crossfire.
"You need to leave—now!" All Might repeated, his voice sharper this time, carrying the weight of authority that had guided an entire society for years, even as blood ran down his side and his time limit ticked dangerously close to zero. "Whatever you are, whoever you are, this fight is beyond you!"
Eggman stared at him again.
Then, slowly… very slowly… he smiled.
Not the kind of smile born from relief.
Not even arrogance.
But the kind of smile that came from someone who had just realized he was standing in a room full of idiots.
"Beyond me?" Eggan echoed, his voice dripping with disbelief as he lifted a gloved hand to his chest, as if genuinely checking whether All Might had just said that to him.
"Oh, that's rich. That is absolutely rich."
Behind him, the Eggmobile hummed slightly louder as Eggman turned and began to get into it, almost like it was responding to his rising irritation, its smooth metallic surface reflecting the burning remains of Kamino Ward as if it belonged there more than the shattered buildings did.
The Eggmobile gave a low, rising hum as it lifted a few inches higher off the fractured ground, its smooth metal chell reflecting the burning skyline of Kamino Ward like it had always belonged in a battlefield where the fate of society itself hung in the balance, and as Dr. Eggman settled comfortably into the cockpit with the ease of someone who had done this a thousand times before, his expression shifted from mild irritation into something far more familiar—calculation.
"Now then…" Eggman muttered, tapping a few commands into the controls as holographic displays flickered to life around him, each one rapidly scanning the environment, the energy signatures, the structural integrity of the surrounding ruins, and most importantly—the two beings standing in front of him who were radiating enough power to make even his most advanced machines flag them as immediate threats.
All Might didn't move at first, but the tension in his body sharpened into something dangerous as he planted himself firmly between Eggman and All For One, his instincts screaming at him that whatever this man was, whatever that machine was, letting him wander freely in the middle of this battlefield would be a mistake he couldn't afford to make.
"I said get out of here!" All Might barked again, louder this time, his voice cutting through the chaos with the authority that had defined an entire era, even as his weakened body trembled under the stress of holding his form together. "This isn't a place for civilians—!"
"Oh, do stop repeating yourself," Eggman interrupted, waving a dismissive hand as if swatting away something insignificant, his tone carrying the kind of annoyance only someone with an absurd level of confidence could manage in a situation like this, and as he leaned back in his seat, crossing one leg over the other, he finally looked directly at All Might with a smirk that practically radiated superiority.
"You keep calling me that word… civilian," Eggman continued, dragging the word out like it physically offended him, before his grin widened just enough to show teeth. "And i can assure you, there is absolutely nothing 'civil' about me."
There was a pause.
A brief, almost surreal pause where even the distant crackling od fires seemed to quiet, as if the world itself was waiting to see how this interaction would escalate.
Then All For One laughed.
Not loudly, not explosive.
But it carried.
The kind of laugh that wormed its way into the air and settled there like a stain, thick with amusement and just a hint of irritation, as his head tilted slightly, his unseen gaze locking onto Eggman with interest that bordered on predatory.
"How fascinating…" All For One mused, his voice smooth and composed despite the chaos surrounding them, his grotesquely enhanced arm shifting slightly as the mass of stolen Quirks within it adjusted in response to his curiosity. "Another player enters the stage at the climax of the performance… and with such confidence, no less."
Eggman turned his head just slightly, meeting that unseen gaze without even a hint of hesitation, and for a moment—just a moment—the battlefield felt like it had shifted from a clash of heroes and villains to something else entirely.
A clash of egos.
"Oh, i don't 'enter' stages," Eggman replied casually, one hand resting against his cheek as if he were bored. "I build them."
All For One's smile didn't fade.
But it sharpened.
"Is that so?" he asked, the faintest edge creeping into his voice as his arm flexed, the air around it distorting from the sheer power contained within. "Then tell me… who exactly are you supposed to be?"
All For One's question didn't echo—it settled, like a challenge thrown onto a battlefield that had suddenly become far more crowded than either side had planned for, his warped arm flexing as the stolen Quirks within it churned restlessly in response to something new, something unknown, something that did not belong to the system he had spent decades mastering.
Eggman didn't answer immediately.
Instead, the low hum of the Eggmobile deepened, shifting pitch as unseen systems spun up beneath its polished shell, while faint lines of light traced across its surface like veins of energy waking from a long slumber, and for a moment—just a moment—it felt like the battlefield itself had begun to orbit around him.
Then he sighed, not out of fear or out of exhaustion.
But out of disappointment.
"Honestly…" Eggman muttered, pinching the bridge of his nore as if the entire situation had personally inconvenienced him, his mustache twitching in irritation as his gaze flicked between All Might and All For One like he was assessing two particularly underwhelming lab results. "You people really do have a flair for theatrics, don't you?"
(I mean i'm not complaining) Eggman thinks.
All Might tensed instantly, every instinct screaming at him that something about this man was fundamentally wrong in a way he couldn't immediately define, his body shifting just enough to remain between Eggman and the civilians beyond—even now, even like this—because whatever this was, it wasn't something he could ignore.
"This is your last warning!" All Might barked, his voice cracking slightly under the strain but still carrying that overwhelming weight of authority that had defined an entire generation. "Leave this area immediately! You're in danger!"
Eggman slowly turned his head.
And this time… he laughed, not manic, not wild…
But offended.
"Oh, i assure you…"Eggman said, his voice lowering as his grin stretched wider, sharper, something almost dangerous creeping into it as he placed one gloved hand dramatically against his chest. "The only danger here… it to everyone else."
Then he stood.
The Eggmobile rose with him, lifting higher into the air as if responding to his presence alone, it sengines flaring with a low, powerful resonance that didn't sound like anything the people of this world had ever heard before, the air around it subtly warping as systems far beyond modern understanding came online in rapid succession.
"Since you insist on asking…" Eggman continued, spreading his arms outward as if addressing not just All Might and All For One, but the entire world watching through screens and broadcasts, his voice rising with theatrical grandeur that demanded attention whether anyone wanted to give it or not—
"Allow me to enlighten you!"
The Egg Mobile's systems flared.
A pulse of energy rippled outward.
And for a split second every camera feed in Kamino glitched.
Every screen flickered.
Every signal bent.
Then stabilized… focused entirely on him.
"I am the incomparable!" Eggman declared, his voice booming across the battlefield as if he had hijacked reality itself to make sure he was properly introduced. "The unparalleled! The undisputed pinnacle of human intellect!"
His grin widened.
"I am Doctor Ivo Robotnik!"
A pause.
Just long enough to let it sink in… then his arms spread wider.
"And you may refer to me as your future ruler!"
The Eggmobile flared brighter.
"Your next GENIUS OVERLORD!!"
Silence followed that loud declaration.
Not the quiet kind.
The heavy kind.
The kind that pressed down on everyone watching—heroes, civilians, villains alike—as the weight of that declaration settled into something very, very real.
Midoriya's mouth had gone completely dry as he stared at the screen, his brain scrambling to process what he had just heard, because everything about that introduction—everything—felt wrong in a way that went beyond simple arrogance.
"…He just… announced world domination," Kirishima muttered, blinking rapidly as if that would somehow make the situation less insane.
"…With confidence," Momo added quietly, her mind already racing through possibilities, probabilities, worse-case scenarios—all of which were getting worse by the second.
Bakugo, meanwhile…
Grinned.
"…Heh."
Because that wasn't fear.
That was a challenge.
All Might tared at Eggman, genuinely caught off guard for a fraction of a second as his mind tried to reconcile the sheer absurdity of what he had just heard with the very real danger radiating off the man in front of him.
"…You've got to be kidding me…" All Might muttered under his breath.
All For One did not share that sentiment.
Because where the others heard arrogance… he heard competition.
And for the first time since the fight began… his smile twitched.
"…Overlord?" All For One repeated slowly, his voice losing that smooth amusement and gaining something colder, sharper, something that carried just the faintest edge of genuine irritation. "How… bold of you."
Eggman didn't even look at him.
"Correct."
That was it, that single word was dismissive, absolute, final… and that was what did it.
The air shifted and All For One moved, not gradually or cautiously… instantly.
His grotesque arm surged forward, the mass of Quirks within it roaring to life as the limb expanded, twisted, weaponized into something designed for one purpose and one purpose only…
To erase.
"Then allow me to correct that delusion—!"
"Negative."
The word cut through the air like a blade, the voice robotic and mechanical.
A blur of blue and chrome dropped between Eggman and the incoming strike faster than the eye could properly track, the ground beneath it fracturing outward from the force of its arrival as the air itself screamed from the sudden displacement.
And then… impact.
A shield of pure, dark energy flared to life, taking on a diamond shape, catching All For One's attack head-on as the resulting shockwave tore through the battlefield, splitting rubble, ripping apart already-damaged structured, and forcing even All Might to brace himself as the collision sent a violent ripple through the entire area.
Standing there… unmoving… unaffected…
Was NEO Metal Sonic.
His body gleamed with a dark, polished finish, energy pulsed beneath the surface like a living circuit, his eyes glowing an intense, unnatural red as the Black Shield held firm against a force that had just moments ago been overwhelming the Symbol of Peace himself.
And he didn't move an inch.
All For One's attack… just stopped, completely.
For the first time in history…
All For One hesitated.
"…What?" he muttered, the word slipping out before he could stop it, his enhanced arm straining against something that simply refused to break.
Behind Metal a soft voice echoed.
"Father!"
A figure formed beside Eggman, her body phasing into existence like data given shape, glowing faintly as she hovered at his side, her expression very happy as she dives towards Eggman and hugs him.
Eggman wraps one arm around her.
"Excellent timing."
Metal then takes a look over his right shoulder, and sees Eggman. "The Doctor has been located." Metal says his voice metallic and robotic.
Eggman then looks toward Metal and meets Metal's glowing red eyes. "How many times do i have to keep telling you Metal, you don't need to call me Doctor." Eggman says with a look of disappointment, but there is no real malice or disappointment in his voice.
Metal didn't look away from Dr. Eggman as the battlefield roared around them, his crimson optics flickering of a second as if calibrating something far deeper than simple targeting systems, and when he spoke again his tone hadn't changed—but something about it felt… acknowledged.
"…Acknowledge."
There was a pause, subtle but present, before he added—just barely—
"…Father."
Eggman froze.
Not out of fear, not out of confusion… but because that single word landed harder than any attack on the battlefield could have, his usual bombastic expression faltering for the briefest moment as his mustache twitched upward, something dangerously close to prise slipping through the cracks of his ego before he forcibly recomposed himself with a sharp huff.
"Yes, well—about time you got it right," Eggman muttered, waving a hand dismissively as if that hadn't mattered at all, even as the corner of his grin refused to go back down, his posture straightening just a bit more in the cockpit of the Eggmobile.
Beside him, Sage tilted her head slightly, her glowing form stabilizing as she hovered near his shoulder, her eyes moving between Metal and the battlefield with quiet, calculating interest that contrasts heavily with the chaos surrounding them.
"Threat assessment remains inconclusive," Sage stated calmly, her voice soft but precise as streams of data flickered faintly across her form like living code. "However… probability of victory had increased by 73% with Metal Sonic's intervention."
Eggman chuckled at that, low and satisfied, leaning back into his seat as if the outcome had already been decided the moment Metal arrived.
"Well of course it has," he said smugly, gesturing outward toward the battlefield like a showman presenting his masterpiece. "You're looking at the pinnacle of my creations—no, scratch that—the culmination of my genius given form!"
Metal didn't react to the praise.
He simply moved.
Faster than thought, faster than sight, his form blurred forward as the Black Shield collapsed inward and reformed along his arm, condensing into a dense layer of dark energy that pulsed like a contained singularity, and before All For One could even adjust his stance—
Metal Sonic struck.
The punch didn't just land.
It erased distance.
A deafening crack tore though Kamino Ward as All For One's body was launched backward like a missile, the force of the impact detonating the air itself as he was sent tearing through building after building in a straight line across the city, each structure collapsing in violent succession as shockwaves chased his trajectory liek afterimages of destruction.
The entire battlefield went silent for half a second.
The battlefield didn't erupt again immediately—no, what followed was far worse, because for one stretched, suffocating second, everything simply… stopped, as if the entire world had collectively forgotten how to breath after witnessing something that should not have been possible.
Because All For One—that All For One—the man who had just been overwhelming the Symbol of Peace himself… had been launched.
Launched.
Like he weighed nothing.
Across the shattered remains of Kamino Ward, a trail of destruction carved itself in real time as buildings collapsed in sequence, one after another, like dominoes being knocked over by a force that refused to slow down, dust and debris billowing upward into the sky as the shockwave chased his path like a second, invisible impact.
Back in Yokohama, the silence cracked.
Midoriya's voice came first, barely holding together, his entire body trembling as his brain desperately tried to process what his eyes had just seen and failed every single time.
"…He… he just—"
"He punched him," Kirishima finished, though his tone lacked its usual certainty, like even he didn't fully believe what he was saying, his hardened confidence faltering under the sheer absurdity of it all.
Bakugo didn't say anything.
But the grin on his face widened.
Because that wasn't normal.
And that meant it was interesting.
On the battlefield itself, All Might stood frozen for just a fraction longer than he should have, his instincts screaming at him to move, to react, to do something, but his mind—his experience—his very understanding of power had just been challenged in a way he had no immediate answer for.
Because that punch…
That wasn't a Quirk.
Across from him, where the impact had originated, Metal slowly lowered his arm, the dark energy that had reinforced the strike dissipating into faint, flickering embers that crawled across his metallic frame like dying stars, his glowing red optics fixed forward with unchanging, mechanical focus.
Then—without turning—
He spoke.
"Target displaced."
His voice was cold.
Not emotionless… but absent.
Like emotion had never been part of the design to begin with.
Behind him, Eggman let out a satisfied hum as he leaned back in his Eggmobile, one gloved hand stroking his mustache as if he had just watched a perfectly executed experiment unfold exactly as intended.
"Yes, yes, very good," Eggman said, his tone dripping with pride as he gestured lazily toward the destruction Metal had just caused, like it was nothing more than a minor demonstration. "Still flawless as ever."
Beside him, Sage hovered slightly, her glowing eyes tracking the trajectory of All For One through layers of data invisible to everyone else, her expression calm but focused in a way that suggested she was already calculating outcomes far beyond the present moment.
"Re-entry imminent," Sage said softly.
And right on cue…
The air screamed.
From the distance, a shockwave tore back toward them, ripping through the dust cloud like a bullet through glass as a blackened figure shot forward at impossibe speed, the very atmosphere distorting around him from the force of his return.
All For One came back like a missile.
And this time…
He was angry.
The ground shattered beneath his landing as he skidded forward, carving a trench through concrete and debris before stopping just short of Metal Sonic, his warped arm twitching violently as the Quirks within it chumed in agitation, recalibrating, adapting, learning.
"…I see," All For One muttered, his voice lower now, stripped of its earlier amusement and replaced with something far more focused, far more dangerous. "So you're not human."
Metal didn't respond.
Didn't react.
Didn't even acknowledge the statement.
Behind him, Eggman sighed dramatically, like he had just been forced to sit through an incredibly boring lecture.
"Well, since we're all getting acquainted…" Eggman said, standing once more in his Eggmobile as he gestured between himself, Sage, and Metal with theatrical flair, his grin stretching wider with every word, "Allow me to formally introduce my children."
He pointed downward slightly.
"The ultimate lifeform of my design—Metal Sonic."
Then, to his side.
"And my most perfect creation—Sage."
There was pride in his voice.
Real pride.
The kind that didn't need to be exaggerated… but was anyway.
Metal tilted his head just enough toward Eggman and Sage.
Then he spoke again.
"Father. Sage."
A pause.
Then—
"Leave the dysfunctional experiment to me."
The wording hung in the air, sharp and deliberate, his crimson optics locking back onto All For One as the battlefield seemed to narrow around them, everything else fading into irrelevance under the weight of what was about to happen next.
Eggman blinked once.
Then grinned.
"Oh, i like that one," he chuckled, clearly amused as he adjusted the controls of the Eggmobile, already turning away like the fight had been decided the moment Metal claimed it. "Very well! Try not to destroy everything, I may want to rule this place later."
Sage glanced once more at Metal, her expression unreadable but her voice soft.
"Victory probability remains high."
And with that… they left.
The Eggmobile rose smoothly into the air, engines humming with quiet power as it ascended away from the battlefield, Sage's form dissolving into streams of light as she phased alongside it, both of them withdrawing without hesitation, without doubt.
Back on the ground, All Might's muscles tensed as he shifted his stance, ready to re-enter this fight—but he hesitated, just for a moment, because something told him this was no longer a battle he could simply step back into without understanding what he was dealing with.
Between him and All For One… Metal Sonic stood alone.
Unmoving.
Unshaken.
And across from him, All For One slowly straightened, his twisted arm flexing once more as new configuration of Quirks surged to the surface, the air around him distorting under the pressure of power being forcibly stacked, layered, weaponized.
"…Very well," All For One said, his voice returning to that calm, controlled tone—but now it carried something new beneath it.
Caution.
"You've earned my attention."
Metal didn't reply.
All For One's words lingered in the air, heavy with restrained hostility, as the battlefield seemed to narrow around the two figures standing at its center, one a culmination of stolen power refined over decades, the other a machine that had just shattered everything that power was supposed to represent.
Then Metal moved.
A sonic boom cracked through Kamino Ward as the space he had occupied collapsed inward, and in the same instant, All For One's head snapped to the side as something invisible slammed into him with enough force to warp the air around his body like glass under pressure.
The impact didn't sent him flying this time.
It drove him down.
The ground beneath All For One detonated, cratering inward as Metal's strike forced him into the earth like a nail being hammered into concrete, shockwaves ripping outward in concentric rings that tore apart what little remained of the surrounding structures.
All Might's eyes widened.
"—He's faster than before…?!"
All For One reacted instantly despite the blow, his grotesque arm twitching as multiple Quirks activated at once, layers of reinforcement, kinetic redirection, and shock absorption stacking over each other in rapid succession as he drove his arm upward in a counterattack meant to obliterate anything in front of him.
"Do not mistake that trick for superiority—!"
His strike landed.
Or at least… it should have.
Because Metal was already gone again.
A blur of motion reappeared behind him, and before All For One could even finish the motion of his swing, a second hit landed—harder, faster, more precise—directly into his spine.
The crack that followed didn't sound like bone.
It sounded like something fundamental being overwritten.
All For One was launched forward this time, skidding violently across the battlefield as his body tore through debris, but he twisted mid-motion, forcing his limbs to stabilize. Quirks firing in sequence as he regained control far faster than any human should have been capable of.
He landed.
Stood.
Adjusted.
"…Adaptation through repetition," he muttered, voice low, analytical even now as his head tilted slightly, unseen eyes locked onto Metal Sonic with growing intensity. "You're learning as you fight."
Metal said nothing.
But his optics flared brighter.
In Yokohama, the crowd had gone from panicking… to something else entirely.
Midoriya's hands were shaking violently now, his notebook forgotten at his side as his mind raced faster than his body could keep up.
"That's not just speed… he's recalculating in real time—every movement, every counter—he's optimizing mid-combat…!"
Iida's glasses caught the light as he adjusted them, but his hands didn't stop trembling.
"That level of processing… that isn't a Quirk… that's—"
"—A monster," Todoroki finished quietly, eyes locked on the screen.
Bakugo's grin sharpened.
"Yeah," he muttered. "And he's winning."
Back in Kamino… All For One moved first this time.
The air warped as he surged forward, his arm expanding again, but now it was different, more refined, more controlled as dozens of Quirks aligned into a singular purpose, compressing power instead of letting it spill outward.
"Let's see you adapt to this!"
He vanished.
And reappeared directly in front of Metal Sonic.
The punch that followed didn't explode outward. It collapsed inward, a condensed, devastating strike designed to bypass durability entirely, it connected, and for the first time, Metal Sonic slid back, not far, barely a meter.
But the ground beneath his feet carved deep grooves as the force pushed against him, his frame humming as systems recalibrated in response to the impact.
All For One smiled.
"Found the threshold."
Metal's head tilted slightly.
His entire body pulsed.
Energy surged across his frame in sharp, angular patterns as his systems updated, the data from the last strike processed, broken down, restructured into something new.
Stronger.
Faster.
More precise.
"All data… processed."
The voice was the same. But now… it felt heavier.
Metal didn't just disappear this time—he collapsed the space between movements, his form flickering in and out of existence like a glitch in reality itself as the ground beneath him caved inward from the sheer force of his acceleration, and before All For One could eve finish adjusting his stance, the machine was already there—already striking—his fist driving forward with surgical precision as if every possible outcome had already been calculated and discarded except the one that guaranteed maximum damage.
The impact landed square into All For One's torso, and for the first time since the battle began, something gave—not just the ground, not just the air—but him, his body folding slightly around the blow as the shockwave didn't explode outward like before, but instead tunneled through him, ripping apart layers of reinforced Quirks that had been stacked to make him untouchable.
All For One's breath hitched—just for a fraction of a second—but that was all Metal needed.
He followed up instantly.
Another strike.
Then another.
Then another.
Each hit came faster than the last, each one more precise, more refined, more perfect than the previous as Metal's systems continuously updated in real time, turning every failed resistance, every attempted counter, into data—into weaknesses.
"—He's not just attacking…!" Midoriya's voice cracked from Yokohama, his eyes wide as his entire body trembled while he leaned forward like he was trying to crawl into the screen itself. "It's learning faster than All For One can adapt—he's closing every gap the moment it appears!"
On screen, All For One tried to retaliate, his grotesque arm swelling again as multiple Quirks activated at once—air pressure, impact redirection, layered durability—but Metal slipped through all of it like it wasn't even there, his body twisting unnaturally as he avoided the strike by mere centimeters before driving his knee upward into All For One's jaw with enough force to shatter the surrounding air.
The crack echoed across Kamino.
All For One staggered.
Actually staggered.
"Impossible…" he muttered, his voice no longer calm, no longer composed, his body twitching as his Quirks scrambled to keep up with damage they weren't designed to handle. "My Quirks… they're being… bypassed—?!"
Metal finally spoke.
"Correction."
His voice cut through the chaos, cold and absolute.
"They are ebing outdated."
And then he vanished again.
All For One had no time to react before he was sent flying upward into the air, his stolen Quirks began to activate all at once as All For One prepared to destroy this robot the next time he came into view.
He never got that chance.
Metal, who is currently high above him, curled himself into a tight sphere as he began to spin rapidly.
Faster.
Faster.
Faster.
All For One felt the change in the air, as did everyone else in Kamino, but when they all looked up…
It looked like a tornado was forming above them, the only difference was the fact that at the center of it was a metallic blue ball spinning at a speed that even All Might in his prime wasn't able to achieve.
The air screamed louder.
Then… it dropped.
Not like a fall.
Not like gravity.
But like a verdict.
All For One's head snapped upward just in time to see it—a compressed sphere of motion and force tearing straight down toward him, the atmosphere igniting around it from friction alone as the sheer velocity bent light into streaks around its path.
"…So this is your answer," All For One muttered, his voice low but steady as every Quirk in his arsenal flared to life at once, layers upon layers of reinforcement, deflection, absorption, and counterforce stacking over his body in a desperate, calculated attempt to meet what was coming.
"Then come."
The impact didn't sound like an explosion.
It sounded like something breaking.
The moment Metal Sonic connected, the ground didn't just shatter—it vanished beneath them, a perfect circular crater forming instantly as the force drilled downward, compressing everything caught in its center as shockwaves tore outward in violent rings that ripped through Kamino Ward like paper.
From Yokohama, the screen glitched violently again.
Midoriya gasped, stumbling forward like he might fall into the broadcast itself, his voice cracking under the weight of what he was seeing.
"Th-that's not just power—he's concentrating all of it into a single point—he's—he's drilling through every defense at once!"
Kirishima's eyes were wide, unblining.
"That's… that's not manly… that's terrifying…"
Bakugo's grin didn't fade.
It sharpened.
"…Yeah," he muttered. "Now that's a real fight."
Back in Kamino…
The crater deepened.
And at the center of it… Metal Sonic emerged first.
Perfect.
Untouched.
Hovering just inched above the fractured ground as faint trails of heat distortion curled off his frame like the aftermath of something that had never even been a challenge.
Beneath him… All For One layed embedded in the earth.
For a moment… he didn't move.
Then… he laughed.
All For One's laughter dragged itself out of the crater like something broken trying to convince the world it was still whole, his body twitching beneath the weight of damage that refused to properly heal as the stolen Quirks within him scrambled, overlapped, and fought to stabilize a form that had just been pushed far beyond anything it had ever needed to endure before.
"…Magnificent…" All For One rasped, his voice uneven now, stripped of that perfect composure he had worn like armor for decades, as he slowly began to rise from the crater with visible strain, fragments of concrete sliding off his shoulders while the warped mess of his arm restructured itself again and again in a desperate attempt to keep up.
Metal Sonic didn't move.
He hovered there—silent, precise, watching—his crimson optics locked onto the villain as if every microscopic shift in muscle, every fluctuation in energy, every failing Quirk had already been recorded, analyzed, and filed away as obsolete data.
"You've forced evolution," All For One continued, straightening despite the damage, though his posture lacked its earlier dominance, his head tilting slightly as if trying to understand something that refused to fit into his worldview, "You've pushed me… further than even he could…"
All Might's breath hitched.
Even now, battered and barely standing, his body screamed at him to move, to act, to stop this, but something deeper—something instinctual—held him in place as his eyes remained fixed on Metal, because whatever this was… it wasn't a fight anymore.
It was a conclusion.
"…That thing…" All Might muttered, his voice low and strained, more to himself than anyone else, "It's not just stronger… it's finishing it."
Back in Yokohama, the silence had returned—but this time it wasn't disbelief.
It was dread.
Midoriya's fingers dug into his sleeves so tightly they trembled, his eyes wide and unblinking as tears threatened to form without him even realizing it, because everything he understood about heroes, about villains, about fighting—none of it applied anymore.
"…He's not stopping…" Midoriya whispered, his voice cracking under the weight of realization as his mind raced faster than he could control it, "There's no hesitation… no limit… he's not trying to win—he's trying to end it completely…"
Iida's posture, usually so rigid and controlled, had faltered entirely as his hands shook at his sides, his voice barely holding together as he spoke.
"This is… this is an execution…"
kirishima swallowed hard, his usual confidence gone as his eyes stayed glued to the screen.
"…That's not manly…" he muttered quietly, "…that's just… brutal…"
Bakugo didn't look away.
"…Yeah," he said, his grin gone now, replaced with something sharper, more focused. "…and he's not even trying."
Back in Kamino, All For One took a step forward—and for the first time, it wasn't dominance.
It was defiance.
"I will not—" he began, his voice rising as the Quirks within him flared violently, overlapping in a chaotic surge of power as he forced his body to respond, to adapt, to fight back—
Metal moved.
In a single motion that the eye could barely track, he appeared directly in front of All For One, one metallic hand snapping forward with perfect precision as it wrapped around the villain's face, fingers locking into place with mechanical certainty as the ground beneath them cracked from the sudden shift in force.
Metal then began to hover higher, dragging All For One upward with him.
Metal's grip tightened.
Not violently at first—but with a slow, mechanical certainty that made it clear there was no hesitation, no second-guessing, no instinct to pull back or reconsider as his fingers locked more firmly against All For One's face, lifting him higher into the air as if the man weight nothing more than scrap metal waiting to be processed.
The battlefield below them shrank.
Rubble.
Fire.
Heroes.
All of it became distant as Metal hovered upward, his crimson optics glowing brighter with each passing second, reflecting not rage—but calculation, endless streams of data flowing behind those unmoving eyes.
All For One didn't struggle at first.
That was the terrifying part.
"…So this is it," he said quietly, his voice no longer booming, no longer theatrical, but stripped down to something raw and analytical as his remainng Quirks flickered weakly against a force that refused to give him any opening.
His warped arm twitched.
Activated.
Failed.
Again.
And again.
And again.
"…No openings… no inefficiencies…" he muttered, almost to himself now, his voice tightening as something unfamiliar crept into it—something that hadn't been there in decades.
Uncertainty.
Below them, All Might staggered forward despite his injuries, his voice breaking through the chaos as he raised a trembling arm.
"STOP!"
I wasn't a command.
It was a plea.
"You've won!" All Might shouted, his voice cracking under the weight of everything happening at once, his instincts screaming that something had gone horribly wrong beyond the fight itself. "There's no need to go any further—he's defeated!"
Metal didn't look at him.
Didn't acknowledge him.
Because to Metal… this wasn't winning.
It was about completion, to eliminate any competition that could pose a threat for his father's world dominance.
In Yokohama, the screen trembled as the camera tried to stabilize on the airborne figures, and the crowd that had once cheered now stood frozen in a silence so heavy it felt suffocating.
Midoriya's breath hitched.
"…He's not stopping…" he whispered, his voice shaking as his mind raced faster than he could control it. "He's not… he's not even considering it…"
Iida's glasses caught the light as his hands trembled at his sides.
"This isn't justice…" he said, his voice was tight with panic. "This is—this is beyond heroics!"
Todoroki's gaze remained locked on the screen, but for once… there was no calm in it.
"…He doesn't have a reason to stop," he said quietly.
Kirishima swallowed hard.
"…That's not a fight anymore…" he muttered.
Behind them… Bakugo didn't speak.
But his expression had changed, because even he could see it now, this wasn't strength, this was something else.
Back in the air… All For One finally understood.
Not in the way he understood Quirks—catalogued, stolen, refined—but in a way that slipped through every system he had ever built, every layer of control he had relied on, every assumption that the world could be bent, shaped, and ruled so long as one possessed enough power to enforce.
Because this… wasn't power.
this was something else.
Held in the iron grip of Metal Sonic, his body suspended high above the ruined remains of Kamino Ward while the wind screamed past them in violent currents, All For One felt it for the first time in decades…
Not fear.
But irrelevance.
"…You're not… human." All For One said slowly, the words dragging themselves out with a clarity that felt almost foreign to him, his remaining Quirks still firing, still adapting, still trying—and failing—to find a solution that did not exist.
Metal said nothing.
Did nothing.
His grip didn't tighten in anger, didn't shift in response to the words, didn't even acknowledge them, because there was nothing to acknowledge.
It was simply… correct.
Below them, All Might's voice broke through the chaos again, louder this time, desperate in a way that clashed violently with the unshakable symbol he had always been, his body trembling as he forced himself forward despite the pain tearing through him.
"STOP THIS!" All Might roared, his voice cracking under the strain as he looked up at the two figures in the sky, one helpless, the other completely unshaken. "That's enough! He's defeated! There's no need for this!"
For a moment—just a moment—it almost sounded like the voice of a man, not a symbol.
All For One heard it.
And for the first time… he almost agreed.
"…How ironic," he muttered, his voice quieter now, stripping of grandeur, stripped of control, as his unseen gaze tilted slightly downward toward All Might. "The Symbol of Peace… begging to show me mercy."
His arm twitched again.
Activated.
Failed.
Again.
And again.
Nothing worked.
Nothing could work.
And that was when it clicked.
Not the mechanics.
Not the strategy.
But the truth.
"…I see," All For One whispered, something hollow creeping into his voice as the realization settled in completely, his body finally going still—not because he had given up, but because there was nothing left to do.
"…I made a mistake."
Metal's optics flared.
And for the first time since the fight began… he responded directly to All For One.
"Correction."
his voice was flat, absolute.
"You were inefficient."
All For One let out a small breath—something that might have been a laugh if it had any life behind it.
"…So this is what comes after me," he said quietly, almost thoughtfully, as if he were observing the future of villainy from the outside rather than standing at its end. "Not ambition… not control…"
His head tilted slightly in Metal's grasp.
"…Just inevitability."
Below, All Might took another step forward, his hand reaching upward despite knowing he couldn't reach them, his voice raw.
"Please…!"
Metal moved.
Not fast, not dramatic, just… final.
His other hand rose.
Gripped.
And with a single, precise motion…
He tore.
It wasn't messy.
It wasn't chaotic.
It was precise—horrifically, mechanically precise—as Metal's grip tightened just enough before separating, a clean, instantaneous motion that didn't allow for struggle, didn't allow for resistance, didn't allow for anything at all beyond the completion of the action.
For a single, stretched moment… nothing moved.
Then the body dropped.
All For One's headless form fell from the sky like discarded scrap, slamming into the ruined ground below with a heavy, final impact that echoed across what remained of Kamino Ward, dust and debris rising around it in a slow, suffocating cloud.
All Might froze.
"…No…" he whispered, his voice barely audible now as his outstretched hand trembled midair, his mind struggling—failing—to process what had just happened in front of him. "…That's not… that's not how this is supposed to end…"
High above… Metal Sonic hovered.
In one hand…
He held the proof.
The battlefield didn't erupt into noise.
It collapsed into silence.
In Yokohama, Midoriya's breath hitched violently as his entire body locked up, his voice failing him completely as his mind tried to reconcile the idea of a villain being defeated with what he had just witnessed—a completel, merciless end with no restraint, no capture, no justice.
"…He… he…" Midoriya couldn't finish.
Iida's glasses slipped slightly down his nose as his rigid posture finally broke, his voice shaking in a way that betrayed everything he believed about order and law.
"…That… that wasn't apprehension…" he said weakly. "…That was… execution…"
Todoroki didn't look away.
"…There was never another outcome," he said quietly, though there was something deeply unsettled beneath his usual calm.
Kirishima swallowed hard.
"…That's not what heroes do…"
Bakugo didn't respond.
Because even he… didn't have a comeback for that.
Back in Kamino…
Metal moved again.
Not toward All Might.
Not toward the battlefield.
But upward.
In a blur of blue and chrome, he shot into the sky toward one of the hovering news helicopters, his speed splitting the air apart as he reached it in less than a second, forcing the pilot into a panicked attempt to stabilize as the machine suddenly found itself face-to-face with something far beyond its understanding.
"W-what is that thing?!" the cameraman shouted, scrambling as the lens struggled to focus.
Metal didn't ask permission.
He took control.
With a single motion, he seized the front of the helicopter, his other hand reaching forward as the camera feed violently stabilized—not by the operator's control, but by his.
Across Japan…
Every screen shifted.
Every broadcast locked.
And at the center of it all…
Was Metal Sonic.
Hovering in the sky.
Holding All For One's severed head in clear view.
The silence that followed was suffocating.
The Metal spoke.
"Observation complete."
His voice carried perfectly through every speaker, every device, every broadcast signal.
"The previous dominant threat had been eliminated."
A pause.
His optics burned brighter.
"Result: Total victory."
He raised All For One's severed head slightly.
"Let this serve as confirmation."
And then—
"Glory to the Eggman Empire."
The feed cut.
Not abruptly.
Deliberately.
Because he was done.
The helicopter spun slightly as Metal released it, the pilot shouted in panic as they regained control, but Metal was already gone—descending rapidly back toward the ruined battlefield below.
All Might didn't move.
Couldn't move.
He just stood there… staring.
Metal landed in front of him.
Silently.
Calmly.
And then—
He dropped it.
All For One's head hit the ground at All Might's feet with a dull, final thud, rolling slightly before coming to a stop, dust settling around it like the world itself didn't know how to react.
Metal tilted his head slightly.
"Souvenir."
The word wasn't mocking.
It wasn't emotional.
It was just… stated.
"…You…" he started, his voice shaking, his fists clenching as something between anger and horror surged through him. "You didn't have to—he could have been imprisoned! He could have—!"
Metal interrupted.
"Correction."
His optics flared one last time.
"Risk eliminated."
And then… he was gone.
A sonic boom cracked through Kamino Ward as Metal Sonic vanished in a streak of blue, the air collapsing inward where he had been standing just moments before, leaving nothing behind but silence, destruction…
…and the undeniable truth that whoever this Dr. Ivo Robotnik was… he was a danger to everyone, and everything…
…especially that robot.