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Wrong Best Friend

Summary:

Kageyama Tobio suffers the terrible consequences of introducing two compatible friends. She had thought Isagi Yoichi was comfortable, which was already dangerous for someone who treats feelings like unsolved coursework. Then Hinata Shoyou arrived, with sunshine loud enough to redirect Isagi's attention, and Kageyama became the most included third wheel alive.

Enter Bachira Meguru: soccer gremlin, emotional menace, and the only person delighted enough to sit beside Kageyama during the slow-motion romantic disaster of two puppies discovering affection under fluorescent campus lights.

Bachira notices too much. Kageyama glares too much. Everyone else is doomed.

Notes:

This story is self-indulgent and born entirely from my whims, enjoy!

(See the end of the work for more notes.)

Chapter 1: Accidental Cupid

Chapter Text

Kageyama Tobio did not think much of Isagi Yoichi the first time she met him.

That was not an insult. In Kageyama’s world, not thinking much of someone was often the safest category a person could fall into. It meant they had not done anything stupid enough to irritate her, loud enough to exhaust her, or complicated enough to require an emotional response she did not know how to give. It meant they were allowed to exist beside her without becoming a problem.

Isagi Yoichi entered her life on a Tuesday morning in Introduction to Social Psychology, carrying a navy backpack, a half-finished convenience store coffee, and the slightly panicked expression of someone who had misjudged the distance between his previous class and this lecture hall. His hair was wind-ruffled from running across campus, his breathing was controlled but not fully steady, and when he scanned the rows for an empty seat, he did it with a quick, assessing sharpness that did not match the otherwise harmless first impression he gave.

Kageyama noticed that part.

She noticed things like that, even when she did not mean to. People revealed themselves through their eyes before their mouths caught up. Some people searched a room for friends. Some searched for exits. Some searched for attention. Isagi searched like he was mapping the place in pieces: front row too exposed, back row too crowded, middle left occupied by a group chatting loudly, middle right with one empty chair beside a girl whose resting face had already discouraged three other students from trying.

That girl was Kageyama.

Isagi chose the empty chair beside her.

“Is this seat taken?” he asked, voice low enough not to disturb the professor arranging papers at the front. His tone was polite but not overly cautious, and his eyes moved once to the notebook she had placed on the desk, as if checking whether it counted as a territorial marker.

“No,” Kageyama answered, her voice flat with the natural severity that made ordinary answers sound like warnings. She shifted her notebook two centimeters closer to herself because his sleeve had brushed the edge of it, then returned her attention to the lecture screen like the conversation had ended permanently.

Isagi sat down without acting offended.

That was the first point in his favor.

Most people reacted to Kageyama in one of three ways: they got nervous, got defensive, or got weirdly determined to make her smile as if her face was a group project. Isagi did none of those things. He placed his coffee near the corner of his desk, opened his laptop, and copied the lecture title before the professor even began speaking. His handwriting, when he switched to a notebook after his laptop battery warning appeared ten minutes later, was neat enough to be readable but quick enough to survive a fast lecture. He underlined key terms twice, circled things that sounded important, and wrote small question marks beside concepts that needed clarification.

Kageyama, who had been pretending not to notice, looked at his notes for half a second too long.

Isagi noticed her noticing.

“You missed the term before cognitive dissonance,” he murmured, leaning just slightly toward her without crowding her space. He tapped the line on his notebook with the end of his pen, his expression open and practical rather than smug. “It was attitude-behavior inconsistency. The professor said it fast.”

Kageyama looked at him, then at the note, then back at him with the kind of blank stare that had made an upperclassman in orientation apologize for breathing too loudly.

Isagi waited.

“Thanks,” she said eventually, the word coming out stiff but not unwilling as she wrote the missing term into her notebook.

“No problem,” Isagi replied, his mouth curving briefly as he returned to his own notes. He did not push the conversation further, did not ask for her name immediately, and did not comment on how serious she looked while copying down a term from an introductory class.

That was the second point in his favor.

By the end of the lecture, Kageyama had decided Isagi Yoichi was acceptable.

This was, by her standards, practically intimacy.

They met again the following week because university seating habits were more powerful than fate. Kageyama arrived early, as usual, and took the same chair in the middle-right row because it had a stable desk, good visibility, and enough distance from the air conditioner that her fingers did not go numb while writing. She did not reserve the seat beside her. She simply placed her bag on the floor instead of the chair and refused to examine why.

Isagi arrived two minutes before class with less panic than the first time. His coffee was different, the cheap black kind from the vending machine near Building C, and his hair was still slightly damp from what looked like a rushed shower after morning practice. There was a faint grass smell clinging to him, sharp and clean beneath the detergent of his hoodie.

He paused beside her row, glanced at the empty chair, and lifted his eyebrows in silent question.

Kageyama stared at the screen ahead. “No one’s sitting there,” she said, voice level and eyes forward, as if the chair’s availability was an objective fact unrelated to her.

Isagi sat down, and because he was not stupid, he smiled only after he turned away.

Their relationship developed in small, unromantic increments that Kageyama understood because they resembled routine more than feeling.

On the third lecture, Isagi lent her correction tape after hers jammed. He passed it over without making a big event of it, his fingers careful not to touch hers. Kageyama accepted it, fixed the mistake in her notes, then returned the tape with a short, “Useful,” spoken in the same tone another person might use for praise.

Isagi’s smile twitched at the corners. “Glad my correction tape passed the evaluation,” he said softly, amusement present but contained, his attention already moving back to the professor before she could decide whether he was making fun of her.

On the fourth lecture, Kageyama noticed Isagi’s pen running out before he did. She pushed one of her spares across the narrow gap between their desks, expression unchanged while he looked down at it in surprise.

“Use that,” she said, her voice low and impatient in a way that somehow made the help sound like a command. “Your pen is dying.”

Isagi blinked once, then accepted the pen with a grateful nod, his smile warmer than the situation required. “You noticed before I did,” he said, sounding genuinely impressed rather than teasing. “Thanks, Kageyama.”

She paused at the sound of her name.

He had learned it from the attendance sheet, probably. That was normal. They were in the same class. Their professor called attendance during the first week, and Isagi had the kind of brain that stored information if he thought it might become useful later.

Still, Kageyama looked at him for a fraction too long.

“What?” Isagi asked, his voice careful, his pen hovering over the paper as if he had accidentally stepped on something fragile.

“Nothing,” Kageyama said, then immediately regretted choosing a word so vague. She clicked her own pen twice, eyes returning to the front with unnecessary force. “You can keep it until the end of class.”

Isagi studied her profile for one second, then wisely accepted that explanation without investigation.

That was the third point in his favor.

By mid-semester, Isagi Yoichi had become part of Kageyama Tobio’s schedule.

It happened without discussion, which was the only reason Kageyama allowed it. They sat together in Social Psychology. Sometimes they walked to the cafeteria after class because their next lectures were both in the afternoon. Sometimes they exchanged notes, though “exchange” was not always the right word. Isagi wrote good summaries when theories got messy. Kageyama wrote terrifyingly accurate lists of definitions, examples, and professor habits, including a section titled Things He Repeats Because They Will Be On The Exam.

Isagi stared at that heading the first time she showed him, then laughed quietly into his palm.

“Why are you laughing?” Kageyama asked, her eyes narrowing as if laughter was a suspicious chemical reaction.

“You make the professor sound like prey you’ve been tracking,” Isagi replied, lowering his hand from his mouth. His voice held a gentle humor that did not jab at her, and his eyes were bright with the kind of interest that made him look less ordinary than he usually seemed. “It’s impressive.”

Kageyama looked down at the notes, then back up at him. “He repeats things loudly and walks slower when the slide matters,” she explained, because to her this was not impressive but obvious. “People should notice.”

“People should,” Isagi agreed, still smiling, “but most people don’t.”

Kageyama did not know what to do with that answer, so she ate one bite of curry and decided the conversation was finished.

Isagi let it finish.

That was another point.

The cafeteria became their second shared place after the lecture hall. It was a wide, noisy room with high windows, plastic trays, too many students, and the constant overlapping sounds of chairs scraping, phones buzzing, and someone somewhere laughing too loudly at all times. Kageyama disliked it on principle. There were too many bodies moving without pattern and too many conversations crossing over each other until the air felt crowded.

Isagi did not make the cafeteria quieter, but he made sitting there less annoying.

He had a habit of choosing tables near the wall, where Kageyama could see the room without having people constantly passing behind her. He never announced that he was doing it for her. He simply started walking toward those seats whenever they entered together, carrying his tray with the distracted focus of someone making a decision in the background of his mind. Kageyama noticed by the third time and decided not to mention it, because mentioning it would require acknowledging that it mattered.

Isagi also learned that Kageyama did not like being asked too many open-ended questions while eating. If he asked, “What do you think about the assignment?” she answered easily. If he asked, “How are you feeling today?” she looked at him like he had handed her a puzzle missing half the pieces.

So he adjusted.

Isagi was good at adjusting.

That was perhaps the most dangerous thing about him, though Kageyama did not know enough yet to call it dangerous. He watched, learned, and changed his approach with a naturalness that made people comfortable before they realized they had been read. On the soccer field, that made him the kind of player who could slip into blind spots and turn a losing play into a path toward goal. In ordinary life, it made him the kind of friend who remembered that Kageyama preferred black coffee on exam mornings, plain milk on regular days, and nothing sweet unless she had been studying long enough to forget hunger.

Kageyama did not think of that as affection.

She thought of it as data accuracy.

This was why she was doomed.

One Thursday, after a lecture on interpersonal attraction that had made half the class giggle and the professor look deeply tired, Isagi walked beside Kageyama toward the cafeteria under a sky thick with early summer humidity. The campus trees were painfully green, the kind of green that looked fake under strong sunlight, and students had begun abandoning jackets over their arms while complaining about the heat.

Kageyama walked with her usual long, efficient stride, black hair tied into mid ponytail, enough to keep it off her neck. At 5’7”, she was taller than many of the girls around her, and the sharp economy of her movement made people step aside without realizing they were doing it. She wore a white plain shirt with sleeves loosely rolled to the wrists, tucked into a dark satin long skirt, simple and neat, with a canvas tote over one shoulder and the expression of someone heading to a scheduled execution rather than lunch.

Isagi kept pace beside her, hands loosely gripping the straps of his backpack. His soccer club jacket was tied around his waist, and the faint tiredness around his eyes suggested morning practice had been rough.

“You have practice again later?” Kageyama asked, not looking at him as they crossed the courtyard. Her voice came out direct, almost abrupt, but Isagi had learned by now that abrupt did not mean uninterested. With Kageyama, asking at all was the interest.

“Yeah, evening session,” Isagi answered, rolling one shoulder as if remembering the weight of the morning drills. “Coach said we’re doing small-sided games today. Bachira’s probably going to make it weird.”

Kageyama glanced at him. “Bachira?”

“My friend from the soccer club,” Isagi explained, and there was an immediate shift in his expression, something fond and exasperated pulling at his mouth. “He plays like he’s hearing music no one else can hear. It works, which is annoying.”

Kageyama absorbed that description with the seriousness of someone evaluating a weather warning. “That sounds inconvenient.”

“It is,” Isagi said, laughing under his breath. “But he’s fun. Most of the time.”

Kageyama did not ask further because Isagi’s friendships outside her were none of her business. She knew he had them, obviously. Isagi was not a solitary person. He greeted people easily around campus, waved at soccer club members across walkways, and had a way of being pulled into conversations without seeming trapped by them. He belonged to more places than she did.

That did not bother her.

There was no reason for it to bother her.

They reached the cafeteria entrance, where the lunch rush had already formed a messy current of bodies. Isagi slowed half a step, eyes moving over the crowd with that familiar assessing look. Kageyama watched him identify an open table near the back wall before she did, and something in her chest settled with the quiet satisfaction of a routine continuing correctly.

Then someone shouted her name.

“Tobio!”

Kageyama stopped so abruptly that Isagi nearly walked past her. The voice came from the side path near the vending machines, bright enough to cut through the cafeteria noise and familiar enough to make Kageyama’s shoulders drop by a millimeter in resignation.

Hinata Shoyou came running toward them like the campus had personally challenged her to a race.

She was shorter than Kageyama by enough to make their height difference immediately noticeable, but there was nothing small about the force of her presence. Her orange hair bounced around her face, her tote bag slapped against her hip, and her open cardigan streamed behind her as if it had given up trying to behave. She dodged two students, apologized to one with a breathless laugh, and arrived in front of Kageyama with flushed cheeks and shining eyes.

Kageyama looked down at her. “You’re loud,” she said, her face calm in a way that suggested this was both greeting and accusation.

“I was calling you because you walk like you’re trying to leave the earth,” Hinata replied, bending slightly to catch her breath. Her voice carried the sunny indignation of someone who had never once considered being quieter as a solution to anything. “I texted you three times.”

“My phone is on silent,” Kageyama said, pulling it from her pocket to check. She stared at the screen, saw the messages, and frowned as if the phone had betrayed her. “You texted me pictures of bread.”

“Because the bakery near the west gate has melon bread today,” Hinata explained, pointing toward the direction she had come from with urgent seriousness. “That’s important information.”

“It’s bread,” Kageyama said, unimpressed.

“It’s good bread,” Hinata corrected, then finally seemed to notice Isagi standing beside Kageyama. Her expression shifted immediately from complaint to curiosity, warm and open in a way that made strangers feel invited before they had agreed to anything. “Oh, sorry. Were you two going to lunch?”

Isagi, who had been watching the exchange with visible fascination, straightened slightly when Hinata looked at him. His expression was friendly, but Kageyama saw the moment his attention sharpened—not tense, not uncomfortable, just awake.

Something about Hinata did that to people. She entered a space with too much light and expected everyone else to adjust.

Kageyama, who had adjusted years ago against her will, turned her face toward Isagi with the casual thoughtlessness of someone introducing two separate parts of her life that had no reason to collide badly.

“This is Hinata Shoyou,” she said, her voice matter-of-fact as she gestured with one hand. “She’s in my department. She’s noisy, but she’s not bad.”

Hinata’s mouth fell open in offended betrayal. “Tobio, that introduction makes me sound like a broken appliance,” she protested, looking up at Kageyama with her cheeks puffed slightly. Her annoyance lasted less than a second before she turned to Isagi with a bright, apologetic smile. “I’m Hinata. Sorry, she talks like that when she likes people.”

Kageyama’s head snapped toward her. “I don’t talk like anything,” she said, her brows drawing together as if Hinata had committed academic fraud.

“You do,” Hinata replied cheerfully, not even slightly intimidated. “When you hate someone, you just stare. When you like someone, you insult them in detail.”

Isagi laughed.

It was not loud. It was not dramatic. It was just a short, surprised sound that escaped before he could arrange it into politeness. But Kageyama heard it clearly anyway.

She had heard Isagi laugh before. He laughed at jokes from classmates, at ridiculous mistakes in group chats, at Bachira’s messages when they appeared during lunch and made him shake his head. His laughter was usually soft and contained, shaped by consideration for the people around him.

This one came out differently.

Hinata looked pleased, as if making someone laugh was a successful introduction rather than an accident. Isagi rubbed the back of his neck, still smiling, his eyes lingering on Hinata’s face with a focus Kageyama did not yet know how to interpret.

“I’m Isagi Yoichi,” he said, his tone warm and slightly more animated than it had been a moment earlier. “I’m in Kageyama’s psychology class. And for what it’s worth, I think ‘noisy but not bad’ is probably a compliment from her.”

Hinata pointed at him immediately, eyes widening with delighted recognition. “See? You understand her already,” she said, turning to Kageyama with the triumphant expression of someone who had found supporting evidence. “He understood. That means I’m right.”

Kageyama stared at Isagi, not because she was angry, but because he had sided with Hinata within ten seconds of meeting her. “Don’t encourage her,” she said, her voice low with warning, though there was no real heat behind it.

Isagi held up both hands in a small surrender, but his smile remained. “I’ll be careful,” he said, and despite the words being directed toward Kageyama, his eyes flicked back to Hinata as if drawn by motion, color, or simple interest.

Hinata leaned slightly forward, her attention jumping to the jacket tied around Isagi’s waist. “Are you in the soccer club?” she asked, her voice bright with immediate curiosity. “I saw the campus team practicing once near the east field. Someone kicked the ball so hard it almost hit the snack truck.”

Isagi’s expression changed again.

This time, it was subtler but deeper. Soccer was a switch in him. Kageyama had seen it before when classmates asked casual questions and Isagi tried to answer normally, only for his eyes to become too focused halfway through. He was kind in ordinary conversation, but when soccer entered the subject, something competitive and hungry moved beneath the surface.

“Probably Barou,” Isagi said, his mouth twisting as if the memory was both annoying and funny. “Or Kunigami, if it was during shooting practice. Was anyone yelling?”

“There was a tall guy yelling about people being peasants,” Hinata replied, face scrunching as she searched her memory. “So maybe the first one?”

“That’s Barou,” Isagi said with the immediate certainty of a man identifying a natural disaster. His smile widened, and Hinata laughed at his expression.

Kageyama watched them.

She did not feel anything dramatic. No stab through the chest. No grand collapse. No sudden music swelling in the background of her life. Mostly, she felt the mild irritation of standing still while two people blocked the cafeteria entrance.

But there was also a small, precise shift in the air.

Isagi was still beside her. Hinata was still Hinata. Nothing had been taken. Nothing had been promised in the first place.

And yet Isagi’s attention, which had always felt steady when placed near Kageyama, had turned toward Hinata with an ease that was almost embarrassing to witness. It was like watching a compass find north.

Hinata seemed unaware of it. She was too busy describing the snack truck incident with unnecessary gestures, her hands moving as she explained how the vendor had ducked and how someone else from the soccer club had shouted an apology while laughing. Isagi listened with full attention, his head tilted slightly, eyes tracking her expressions as if each one gave him more information.

Kageyama looked at Isagi’s face, then at Hinata’s, then at the cafeteria line growing longer behind them.

“You two are in the way,” she said, her voice cutting through Hinata’s story with blunt practicality. Her expression remained unreadable, but there was a slight tension in the way her fingers adjusted the strap of her tote. “Move before someone hits us with a tray.”

Hinata startled, then spun around and yelped when she realized three students were awkwardly trying to pass. “Sorry!” she said, bowing quickly with her hands pressed together, her face full of sincere panic. “Sorry, sorry, we’re moving.”

Isagi stepped aside at the same time, his shoulder nearly brushing Hinata’s as they both made space. They glanced at each other over the small accident, and both smiled with the same embarrassed rhythm.

Kageyama saw that too.

Unfortunately.

They ended up eating together because Hinata had the social momentum of a runaway cart and Isagi did not resist. Kageyama found herself at the wall-side table she and Isagi usually used, except now Hinata occupied the seat across from him with a tray full of rice, soup, fried chicken, and the melon bread she had apparently guarded like treasure. Kageyama sat beside Hinata because that was where she always sat when eating with her, and Isagi sat across from Kageyama because that was where he always sat when eating with her.

The arrangement should have preserved the existing order.

It did not.

Hinata talked through lunch with the restless energy of someone who had too many thoughts and no interest in organizing them before speaking. She told Isagi about their department’s awful printer, the professor who assigned group work like punishment, and the time Kageyama scared two senior students away from cheating on a quiz just by looking at them.

Kageyama chewed her food in silence, eyes narrowing slowly. “They were whispering answers,” she said, her tone stern enough to make the memory sound like a court case. “I looked because they were annoying.”

“They apologized to the whole row,” Hinata told Isagi, leaning closer over the table with sparkling amusement. “One of them said, ‘We’ll never do it again,’ and Tobio just nodded like a police officer.”

Isagi laughed again, and this time he looked at Kageyama with familiar warmth. “That sounds like you,” he said, his voice softened by recognition rather than ridicule.

Kageyama felt something settle. See, she thought, though she did not know who she was arguing against. Isagi still looked at her. He still knew her. Nothing had changed enough to matter.

Then Hinata picked up the wrapped melon bread, broke it neatly in half, and held one piece toward Isagi with a smile so easy it bordered on careless. “Here, try it. It’s good,” she said, her tone leaving no room for refusal, as if sharing food with someone she had met fifteen minutes ago was normal because the world was simple when she decided it was.

Isagi looked surprised for half a breath, then accepted it carefully. “Thanks,” he said, his fingers brushing the wrapper rather than her hand, though his eyes lifted to her face when he took it. He bit into the bread, chewed, and then blinked like he had not expected to enjoy it that much. “Oh. It is good.”

Hinata brightened with absurd satisfaction. “Right?” she said, bouncing slightly in her seat. “Tobio acted like I was being dramatic.”

“You were,” Kageyama said immediately, stabbing a piece of chicken with her chopsticks.

“I was correct dramatically,” Hinata replied, looking proud of herself.

Isagi lowered his bread, smiling into the wrapper. “That’s a strong defense,” he said, his voice warm with amusement.

Kageyama looked between them and decided, with the grim patience of a person enduring a minor inconvenience, that lunch had become slightly noisier than expected.

Only slightly.

When Isagi’s phone buzzed, he checked it and grimaced at the screen. Kageyama glanced down automatically, catching a glimpse of a message preview filled with soccer ball emojis and too many exclamation points.

“Bachira?” she asked, remembering the name from earlier.

Isagi sighed, but there was fondness in the sound. “Yeah. He says practice got moved up and that if I’m late, he’ll tell everyone I abandoned him for a secret lunch date.”

Hinata nearly choked on her soup.

Isagi looked horrified the second he realized how that sounded. “Not—he says stuff like that all the time,” he explained quickly, face tightening with embarrassment as he looked from Hinata to Kageyama. “He doesn’t mean anything by it. He just likes causing problems.”

Kageyama considered this with a serious frown. “Your friend sounds defective,” she said, her tone so dry that Hinata had to cover her mouth to stop herself from laughing again.

Isagi exhaled, relief and amusement mixing together. “He kind of is,” he admitted, already gathering his tray with reluctant urgency. “Sorry, I should go before he actually makes it worse.”

Hinata looked up at him, still smiling from behind her hand. “Good luck at practice,” she said, and the words were ordinary, friendly, nothing special, but she said them with her whole attention lifted toward him.

Isagi paused.

It was tiny. Almost nothing. A small hitch in the rhythm of standing, his hand still around the edge of his tray, his eyes on Hinata’s face.

Then he smiled.

“Thanks, Hinata,” he said, voice simple but warmer than the words required. “I’ll see you around.”

Kageyama heard the name.

Not “your friend.” Not “Kageyama’s friend.” Hinata.

He had stored it quickly.

Of course he had. Isagi stored useful things quickly. Names, habits, openings, changes in a room. Kageyama knew that about him. It was one of the reasons sitting beside him was comfortable.

Still, when Isagi turned to her next, his smile shifting back into the familiar shape she knew, she felt the difference before she understood it.

“See you next class, Kageyama,” he said, his tone easy and considerate. “Don’t forget the assignment is due Sunday.”

“I know,” Kageyama replied, because she did know, and because being reminded of things she already knew usually annoyed her.

But Isagi’s reminders had never annoyed her that much.

He left with his tray, weaving through the cafeteria crowd with quick, practiced movement. Hinata watched him go for exactly two seconds too long, chin propped on one hand and smile lingering like she had accidentally found something interesting in the middle of an ordinary day.

Kageyama watched Hinata watching him.

The cafeteria noise pressed around them. Someone dropped chopsticks behind them. A group near the windows burst into laughter. Outside, summer light flashed against the glass doors as students moved between buildings.

Hinata turned back with suspicious brightness. “Isagi seems nice,” she said, trying for casual and failing because she was Hinata.

Kageyama looked at her half-finished lunch. “He is normal,” she said, though the word came out less dismissive than intended.

“For you, normal means good,” Hinata said, resting her cheek in her palm while studying Kageyama’s face with the subtlety of a sunrise. “You sit with him, right? In that class?”

“Yes,” Kageyama answered, reaching for her drink because her throat had gone dry for no useful reason. “The seat is good.”

Hinata’s eyes curved with amusement. “The seat,” she repeated, voice light and teasing but not unkind.

Kageyama drank her milk slowly, then set the carton down with controlled precision. “It has good visibility,” she said, as if that explained everything and closed the matter forever.

Hinata smiled wider.

Kageyama did not like that smile. It was the smile Hinata used when she thought she understood something. Sometimes she did understand things, which made it worse. Kageyama could handle Hinata being wrong loudly. Hinata being right softly was unbearable.

“You should come to the soccer practice sometime,” Hinata said suddenly, her mood jumping tracks with alarming speed. “I want to see the guy who talks like a king. And maybe Isagi’s weird friend too.”

Kageyama stared at her. “Why would I go?”

“Because I’m asking,” Hinata answered immediately, as if that was a complete argument. Her smile became bright and shameless, and she leaned across the table with the confidence of someone who had dragged Kageyama into worse situations and survived. “Come with me, Tobio. It’ll be fun.”

Kageyama’s first instinct was to refuse. Soccer had nothing to do with her. Isagi’s club had nothing to do with her. Hinata’s sudden interest in Isagi’s club especially had nothing to do with her, and the safest thing would be to establish that boundary immediately before Hinata turned it into another routine.

But Hinata was still looking at her with that hopeful expression, and Kageyama had never been good at refusing her when she looked like that. It was not because Hinata was cute. Kageyama rejected that explanation on principle. It was because Hinata had a way of wanting things with her whole face, and ignoring it felt like kicking a small, excited animal.

Kageyama looked away first.

“Only if I finish my assignment early,” she said, voice hard enough to pretend the concession had not already happened.

Hinata’s delighted gasp was loud enough to make two people at the next table glance over. “You’ll come?” she asked, hands clasping around her drink as if Kageyama had promised to cross an ocean rather than stand near a soccer field.

“I said if,” Kageyama replied, her brows lowering as she endured Hinata’s happiness with visible strain. “And stop making that face. It’s annoying.”

Hinata only laughed, pleased and unbothered. “You say that when you already agreed,” she said, pointing her straw at Kageyama like she was presenting evidence.

Kageyama clicked her tongue and returned to her food.

Across campus, Isagi reached the edge of the soccer field five minutes late and found Bachira Meguru upside down on the grass near the sideline, legs draped over a bench, phone held above his face. The rest of the club moved around him with the practiced indifference of people who had learned not to ask why Bachira did anything.

“You’re late, Isagi,” Bachira called without looking up, his voice sing-song and lazy, carrying easily over the thud of balls and the shouts from the field. “Was the secret lunch date delicious?”

“It wasn’t a secret lunch date,” Isagi said, dropping his bag near the bench with a tired glare that lacked real force. “I ate with Kageyama and her friend.”

Bachira’s phone lowered just enough for one golden eye to peek over the screen. His smile changed shape, playful curiosity sharpening into something more interested. “Her friend?” he asked, drawing the words out like he could smell trouble from across campus.

“Hinata Shoyou,” Isagi said, untying his jacket from his waist and reaching for his cleats. He tried to sound normal because it was normal. It had been a normal lunch with Kageyama’s friend. There was no reason for Bachira to make it strange.

Bachira rolled sideways off the bench with boneless ease, landing in a crouch near Isagi’s bag. “Your voice did something,” he said, tilting his head with a grin too wide to be innocent.

Isagi paused with one cleat in his hand. “My voice didn’t do anything,” he replied, but his eyes flicked away a fraction too late.

Bachira saw it.

Bachira saw most things people wished he would miss. He saw the way Isagi’s attention changed on the field before a play formed. He saw when opponents got scared, when teammates got hungry, when someone’s smile arrived half a second behind their feelings. He saw invisible things because he trusted instinct more than explanation, and his instincts were already dancing around the name Hinata Shoyou like it had teeth.

“Hmm,” Bachira hummed, rocking back on his heels. “Kageyama’s friend.”

Isagi tied his cleat with unnecessary focus. “Don’t start,” he said, his tone low and warning, but there was too much embarrassment around the edges for it to work.

Bachira laughed, bright and unbothered, then sprang to his feet. “I didn’t start anything,” he said, stretching both arms above his head with feline satisfaction. “You brought me a new smell.”

“A new what?” Isagi asked, looking genuinely concerned.

“Trouble,” Bachira clarified, eyes gleaming as he turned toward the field. “Fun trouble.”

Isagi stared after him with the tired expression of someone realizing practice was about to be worse than expected.

Back in the cafeteria, Kageyama finished her lunch while Hinata talked about melon bread, soccer practice, and how Isagi had “nice eyes when he listened,” all in the same breathless stream. Kageyama responded when necessary, corrected her when she exaggerated, and told herself that nothing had shifted enough to matter.

Isagi was still her classmate.

Hinata was still her friend.

Lunch was still lunch.

A person could introduce two friends without it becoming anything.

A person could sit in the same chair next week and everything would remain normal.

Kageyama believed that because she had no reason not to.

She did not yet know that some mistakes were quiet when they happened. They did not explode. They did not announce themselves. They slipped into ordinary afternoons wearing the face of a cheerful girl with orange hair and a boy who laughed too quickly.

Kageyama Tobio had only introduced two people.

That was all.

That was the mistake.