Chapter Text
Yokohama had already fallen into chaos.
Now, it was beginning to change.
The difference was subtle at first—easy to miss if you were only focused on survival. The streets were still breaking, the buildings still trembling, and the black vines still spreading through every crack they could find.
But something about the Abyss had shifted.
It was no longer simply growing.
It was organizing.
At the center of the ruined district, the humanoid figure stood motionless for just a moment too long.
It had already attacked.
It had already adapted.
And now—
It was observing.
Not far from the fractured street, Atsushi kept his stance low, claws half-extended, muscles tense with restrained movement. The wind carried dust and ash past him, but he didn’t blink.
“…It’s not rushing anymore.”
Beside him, Ranpo adjusted his glasses slightly, gaze sharp despite his otherwise relaxed posture.
“Yeah,” he said.
“That means it’s thinking.”
Atsushi frowned.
“…That’s worse, isn’t it?”
Ranpo didn’t answer right away.
“…Much worse.”
Behind them, the rest of the Agency had already begun shifting positions.
Kunikida directed movements with quick, precise gestures, his mind already three steps ahead of what was happening in front of him.
“Maintain distance. Do not engage unless necessary. Prioritize containment.”
His voice remained steady—but even he could see it.
The Abyss was no longer reacting blindly.
It was learning.
Near the fractured center of the street, Nahida stood still.
Too still.
The faint green glow around her hadn’t disappeared—it had thinned, stretching outward like threads barely visible to the human eye.
Connecting.
Reaching.
Listening.
The Abyss noticed.
The humanoid form shifted.
Not violently this time.
Not immediately.
It turned.
Slowly.
Directly toward her.
Atsushi stiffened.
“…It sees her.”
“Of course it does,” Ranpo replied quietly.
“She’s the only one it can’t ignore.”
A crack spread beneath the creature’s feet.
It stepped forward.
The movement wasn’t fast.
But it carried intent.
Nahida didn’t move.
Her gaze remained calm, focused—not on its surface, but deeper.
Far deeper.
“…You’re incomplete,” she said softly.
The reaction was immediate.
Violent.
The creature’s form distorted, collapsing inward for a split second before reforming again, its surface rippling like something struggling to hold shape.
Around it, the vines lashed outward—not coordinated, not controlled.
Erratic.
Ranpo’s eyes sharpened.
“…There it is.”
“What?” Atsushi asked.
“It don't like that,” Ranpo said.
A pause.
“…Which means she’s right.”
Below, Nahida took a small step forward.
Just one.
Behind her, Yosano narrowed her eyes.
“…Kid you shouldn’t be walking toward that thing.”
But she didn’t move to stop her.
Because something about the way Nahida stood
Wasn’t reckless.
It was familiar.
The green threads pulsed faintly again.
This time—
Deeper.
And for a brief moment—
The Abyss responded.
Not with violence.
Not with attack.
But with something far more unsettling.
Recognition.
Nahida’s expression shifted ever so slightly.
“…You remember.”
The creature froze.
Completely.
Across the battlefield, everything stilled.
Even the smaller vines paused, their movements slowing as if something larger had taken priority.
Ranpo exhaled quietly.
“…Yeah. That’s definitely bad.”
Because this wasn’t just an enemy anymore.
This was something that knew.
And then—
The connection broke.
Violently.
The ground ruptured beneath them as the creature reacted, its form expanding outward in a surge of black mass, limbs and tendrils forming rapidly, erratically—like something rejecting what it had just experienced.
A spear-like vine shot toward Nahida.
Atsushi moved instantly.
“Watch out!”
He dropped from the rooftop, landing hard between her and the attack, claws slicing through the incoming tendril—
Only for it to dissolve into black fragments and reform behind him.
“…It’s faster!”
“Fall back!” Kunikida ordered sharply.
But before the formation could fully shift—
The pressure changed.
It slammed into the battlefield like a wave.
Gravity.
Several vines were crushed instantly into the pavement as Chuuya landed between the pavements.
The impact cracked what little stability the battlefield had left.
Gravity folded inward around Chuuya as he landed, the pressure forcing several advancing tendrils flat against the broken pavement. Dust and debris lifted into the air for a split second before slamming back down.
The Port Mafia responded immediately.
Behind him, Kouyou advanced with measured calm, her ability cutting through a wave of tendrils that had begun creeping toward the Agency’s flank. The strikes were precise—elegant—but even as the vines were severed, they dissolved and reformed again from the fractured ground.
“They are not decreasing,” she noted.
Above, on the rooftop, Ranpo exhaled softly.
“Because we’re not hitting the source.”
Beside him, Atsushi frowned.
“…Then where is it?”
Ranpo didn’t look away from the battlefield.
“…Somewhere we can’t reach yet.”
Below, the Abyss shifted again.
What had once been chaotic now carried intention.
The humanoid figure twisted unnaturally, its limbs elongating and retracting as if testing its own structure. The second forming mass beside it pulsed, incomplete but stabilizing faster than before.
It was learning.
And it was accelerating.
Then it moved.
A coordinated surge of tendrils burst outward—not randomly, but in targeted arcs. Some struck toward the Agency’s weaker points, others toward the Port Mafia’s positions, forcing both sides to divide their attention.
Atsushi landed hard as he intercepted a tendril aimed at a collapsing evacuation path.
“I’ll cover this side!”
Nearby, Kyouka followed, her blade cutting through multiple vines in clean, controlled arcs. But even she could feel it—
They weren’t slowing it down.
Across the street, Chuuya crushed another mass of tendrils into the pavement, only for them to re-emerge seconds later.
“…This is getting ridiculous.”
Kouyou’s gaze sharpened slightly.
“…It is adjusting to force.”
“Yeah,” a voice cut in lightly.
Dazai stepped forward, brushing dust from his coat as if the battlefield were only a mild inconvenience.
“And not just force.”
He reached out—grabbing a lunging tendril mid-motion.
For a split second—
It vanished.
Gone completely where his hand touched it.
But the rest of it remained.
“…Selective nullification,” Dazai murmured.
“…Annoyingly inefficient.”
Above, Ranpo smirked faintly.
“Welcome to the problem.”
Elsewhere — Sumeru Akademiya
The tension had shifted.
Less shock.
More calculation.
Alhaitham stood at the center of a table covered in scattered reports, diagrams, and theoretical models. None of them were complete.
None of them were satisfying.
But together
They formed a pattern.
"We asked every nation leaders if they saw her or even had hint of where she could be but neither of them knew where she could be."
“…If she is not within our world,” he said calmly, “then she must have been displaced.”
A scholar hesitated.
“Displaced… how?”
Alhaitham didn’t answer immediately.
Because that was the question.
Across the room, Wanderer had already moved on from that uncertainty.
His gaze wasn’t on the papers.
It was distant.
Focused on something no one else could perceive.
“…It’s not just distance,” he said.
“…It’s separation.”
Alhaitham glanced at him.
“Elaborate.”
Wanderer clicked his tongue softly.
“…It’s like she’s been cut off.”
A pause.
“…Not hidden. Not sealed.”
“…Removed.”
The room fell quiet.
One of the scholars frowned.
“That would require a level of spatial manipulation far beyond—”
“Yes,” Alhaitham interrupted.
“…It would.”
He turned slightly, fingers brushing over one of the diagrams.
“…Which means we are not dealing with a conventional method.”
Wanderer pushed himself off the wall.
“…You’re overthinking it.”
Alhaitham didn’t react.
Wanderer’s expression darkened slightly.
“…If she’s cannot come here…”
“…then we go take her back.”
A scholar let out a quiet, incredulous laugh.
“And how exactly do you propose we do that?”
Wanderer didn’t answer immediately.
Because, for the first time—
There was something.
Faint.
Distant.
A disturbance.
His gaze sharpened.
“…There.”
Alhaitham followed his line of sight instinctively.
“…You found something?”
“…Not something,” Wanderer said quietly.
“…A crack.”
The word lingered.
“…Explain.”
Wanderer’s voice lowered slightly.
“…It’s unstable.”
“…Like space isn’t holding properly.”
A pause.
“…Like something forced its way through.”
Silence settled across the room.
Alhaitham’s expression didn’t change.
But his mind moved quickly.
“…A breach.”
“Yes.”
“…And it leads to her.”
This time—
Wanderer didn’t hesitate.
“…I’m going.”
Alhaitham watched him for a moment.
“…You understand the risk.”
Wanderer let out a quiet scoff.
“…I don’t care.”
A brief silence followed.
Then Alhaitham spoke again.
“…If that breach is unstable, you may not return.”
Wanderer turned slightly.
“…Then I won’t come back alone.”
And then—
He moved.
Not with hesitation.
Not with doubt.
With certainty.
Because for the first time since she disappeared,
there was a direction.
And he intended to follow it.
Back to Yokohama
The battlefield had worsened.
Two humanoid forms now stood where one had before.
Both unstable.
Both evolving.
And both—
Moving.
The first lunged toward the Port Mafia line, forcing Chuuya to intercept again as gravity slammed downward in a concentrated burst.
The second—
Turned toward Nahida.
She didn’t step back this time.
Instead—
She raised her hand.
The green light returned.
Stronger.
Clearer.
Not just threads.
Not just roots.
Understanding.
The ground responded.
Branches surged upward—not violently, but firmly—wrapping around the advancing form, slowing it just enough—
Not to stop it.
But to connect.
“…You’re searching,” she said softly.
The Abyss reacted instantly.
Its form distorted violently, rejecting the connection—but not fast enough to avoid it completely.
Fragments passed through.
Memories.
Not clear.
Not whole.
But enough.
“…You’re trying to return,” Nahida murmured.
The reaction was explosive.
The second form surged forward violently—
Straight toward her—
Too fast.
Too close.
From above—
A massive tendril descended.
And then—
The air split.
A sharp, cutting force tore through the attack before it could land.
The tendril fell apart mid-motion.
Everyone froze.
A figure landed between them.
Two slash of wind protected her from a possible impact.
Nahida blinked once.
“…You came.”
Wanderer didn’t look at her.
His gaze was locked on the Abyss.
“…Yeah,” he replied quietly.
“…and you picked a terrible place to disappear.”
Behind him—
Even the Abyss paused.
Because something new had entered the battlefield.
Something that was not in the original plan.
And for the first time—
The balance shifted.
Not in their favor,
Not yet.
But enough—
To change what came next.