Chapter Text
In a world where superhuman abilities known as “Quirks” had reshaped society, dividing humanity into heroes, villains, and civilians, there existed a peculiar anomaly: Yokohama. This bustling port city, nestled along Japan’s eastern coast, had long ago severed ties with the rest of the nation. Its inhabitants, predominantly Quirkless, viewed the chaos of hero-villain conflicts as nothing more than childish folly—a dangerous delusion that threatened true order. Decades prior, during the dawn of the Quirk era, Yokohama’s leaders had declared independence, erecting impenetrable barriers both physical and ideological. High walls, advanced surveillance, and a zero-tolerance policy ensured no outsiders, especially those flashy “heroes,” could breach their sanctuary. Any who tried were met with swift expulsion or, in extreme cases, lethal force from the city’s shadowy enforcers.
The rest of Japan, under the Hero Public Safety Commission (HPSC), had reluctantly accepted this isolation. Yokohama operated as a sovereign entity, its “special decisions government” handling internal affairs with an iron fist. Trade was minimal, information flow restricted, and Quirks? They were dismissed as myths or genetic anomalies best ignored. But whispers persisted: Yokohama harbored its own secrets, abilities born not from Quirks but from something older, more literary—gifts tied to the souls of great authors.
It was against this backdrop that Principal Nezu of U.A. High School found himself in a bind. U.A., Japan’s premier hero academy, had been plagued by leaks and betrayals. A traitor lurked within its walls, feeding information to villains like the League of Villains. Standard investigations by pro heroes had yielded nothing; the HPSC’s resources were stretched thin. Nezu, ever the cunning strategist, sought an outside perspective. Rumors of Yokohama’s elite detectives—members of the Armed Detective Agency (ADA)—reached his ears through clandestine channels. These weren’t Quirk users; they were ability wielders, unbound by hero licenses or public scrutiny. And Nezu, with his insatiable curiosity, yearned to meet a “real Yokohama person” up close.
After delicate negotiations, the HPSC struck a deal with Yokohama’s special decisions government: one skilled detective in exchange for temporary access to U.A.’s intel network. No heroes would enter Yokohama; no Yokohama agents would reveal city secrets. It was a fragile truce, born of mutual necessity.
---
In the heart of Yokohama, the Armed Detective Agency’s office hummed with its usual controlled chaos. Sunlight filtered through the windows, casting long shadows over cluttered desks piled with case files, half-eaten snacks, and the occasional stray cat courtesy of Atsushi Nakajima. The ADA’s president, Yukichi Fukuzawa, sat at the head of the conference table, his stern gaze sweeping over his assembled team. To his right was Kunikida Doppo, adjusting his glasses as he scribbled notes in his ideal notebook. Dazai Osamu lounged lazily across from him, bandaged arms folded behind his head, a mischievous grin playing on his lips. Ranpo Edogawa munched on a bag of sweets, his sharp eyes half-lidded in boredom. Yosano Akiko leaned against the wall, arms crossed, while the Tanizaki siblings—Junichiro and Naomi—sat quietly nearby. Kenji Miyazawa beamed with his usual sunny disposition, and Kyouka Izumi fidgeted with her phone, her demon snow ability a silent presence.
And then there was Atsushi Nakajima, the 19-year-old weretiger, perched on the edge of his seat. His silver hair caught the light, and his youthful face—deceptively boyish—belied the battles he’d endured. He looked no older than 16, a fact that had saved him in undercover ops before but now loomed as a double-edged sword.
Fukuzawa cleared his throat, commanding immediate silence. “Thank you all for gathering on short notice. We have a new assignment from an unusual source.”
Murmurs rippled through the room. Dazai’s grin widened. “Ooh, unusual? Does it involve suicide? Or perhaps a trip to the outside world?”
“Quiet, Dazai,” Kunikida snapped, though his curiosity was piqued.
Fukuzawa continued, his voice steady. “The request comes indirectly from the Hero Public Safety Commission in Musutafu, Japan. They’ve brokered a deal with our government to send one of our detectives to infiltrate U.A. High School—a hero training academy. Their principal, Nezu, suspects a traitor within their ranks who’s been leaking information to external threats. Our role is to identify this individual discreetly.”
Ranpo popped another candy into his mouth. “Heroes? You mean those Quirk weirdos who punch villains on TV? Why us? Sounds like a job for their caped crusaders.”
“Precisely because we’re not part of their system,” Fukuzawa replied. “Yokohama’s isolation makes us neutral. And Nezu… he has a personal interest in meeting someone from our city. But that’s secondary. The mission requires undercover work: posing as a student to gather intel.”
Eyes turned to Atsushi, who blinked in confusion. “Wait, why is everyone looking at me?”
Fukuzawa’s gaze softened slightly. “Atsushi, you’re the ideal candidate. At 19, you can pass for 16 with ease. Your ability, Beast Beneath the Moonlight, is versatile for defense if needed, but you’ll keep it hidden unless absolutely necessary. Quirks are commonplace there, but we don’t want to draw attention to Yokohama’s differences.”
Atsushi’s eyes widened, a mix of shock and reluctance washing over him. “Me? Undercover at a hero school? But President… Fyodor Dostoevsky is still out there. He’s on the run after everything with the Decay of Angels. What if he strikes while I’m gone? I can’t just leave the agency shorthanded!”
The room fell quiet. Fyodor’s shadow loomed large; his manipulative schemes had nearly torn the ADA apart. Dazai chuckled softly, but his eyes held a rare seriousness. “Ah, the rat. Don’t worry, Atsushi-kun. I’ve got my eye on him. Or rather, my noose ready.”
Fukuzawa nodded firmly. “We have everything under control here. Dazai and Ranpo are coordinating with the Port Mafia on potential leads—yes, even Mori has a vested interest in keeping Fyodor contained. Your absence won’t weaken us; it strengthens our alliances. This mission is crucial not just for them, but for maintaining the fragile peace between Yokohama and the outside world. Refusing could invite unwanted scrutiny.”
Atsushi clenched his fists, staring at the table. Memories of Fyodor’s cold intellect and the lives he’d endangered flashed through his mind. But Fukuzawa’s words carried weight—the president had never steered them wrong. Atsushi trusted him implicitly, like a father figure in a world that had orphaned him young. Taking a deep breath, he met Fukuzawa’s eyes. “If you say it’s handled… then I trust you. I’ll go. But promise me—if things escalate with Fyodor, you’ll call me back.”
Fukuzawa’s expression warmed with approval. “You have my word. Prepare your cover: a 16-year-old transfer student from a remote Quirkless area, perhaps with a minor transformation Quirk to explain any slips. Kunikida will handle the forged documents. Yosano, ensure he’s medically cleared.”
As the meeting adjourned, the agency buzzed with preparations. Dazai sidled up to Atsushi, slinging an arm around his shoulders. “Think of it as a vacation, Atsushi-kun! Hero school—full of idealistic kids punching air. Just don’t go turning into a tiger and eating their lunch.”
Atsushi managed a weak smile, but unease lingered. Little did he know, stepping into Musutafu would entangle him in a web of Quirks, betrayals, and revelations that blurred the lines between hero, detective, and the shadows of Yokohama
---
The Armed Detective Agency’s dormitory, a modest building tucked behind the office in Yokohama, was quiet in the late afternoon. Atsushi Nakajima stood in the small, shared room he called home with Kyouka Izumi, his hands methodically folding clothes into a worn duffel bag. The room was sparse but cozy, with Kyouka’s neatly made bed adorned with a single stuffed bunny and Atsushi’s corner cluttered with books and a few keepsakes from his orphanage days. The faint scent of jasmine tea lingered, a remnant of Kyouka’s earlier attempt to calm her nerves.
Kyouka sat cross-legged on her bed, her dark eyes fixed on Atsushi. Her usual stoic demeanor cracked slightly, a rare frown tugging at her lips. “You’re really going,” she said, her voice barely above a whisper. “To that hero place.”
Atsushi paused, a half-folded shirt in his hands. He glanced at her, his golden eyes softening. “Yeah… I don’t want to, but the president says it’s important. It’s just a mission, Kyouka. I’ll be back before you know it.”
Kyouka hugged her knees, her fingers tightening around the fabric of her kimono. “It’s not the same without you here. What if Fyodor comes back? Or the Guild? Or something worse?” Her voice trembled, betraying the fear she rarely showed. After all they’d been through—her escape from the Port Mafia, their battles side by side—she’d grown to see Atsushi as more than a roommate. He was family.
Atsushi set the shirt down and knelt in front of her, offering a reassuring smile. “Hey, the agency’s got this. Dazai’s scheming, Ranpo’s sniffing out clues, and the president’s got everyone in line. Plus, you’ve got Demon Snow. If anything happens, you’ll handle it, right?”
Kyouka hesitated, then nodded slowly. “I’ll protect the agency. But you better not get hurt out there. Those hero people sound… loud.”
Atsushi chuckled. “Loud, huh? I’ll keep that in mind.” He stood, but before he could return to packing, Kyouka slid off the bed and wrapped her arms around him in a sudden, tight hug. Her face pressed against his chest, and for a moment, neither spoke.
“Don’t do anything stupid,” she mumbled. “Come back.”
Atsushi hugged her back, his heart aching. “I promise, Kyouka. I’ll be careful.”
They stayed like that for a few seconds before Kyouka pulled away, her expression back to its usual calm. “You should finish packing. Kunikida will yell if you’re late.”
Atsushi laughed nervously. “Yeah, don’t remind me.”
The shrill blare of an alarm clock jolted Atsushi awake at 3:50 AM. He groaned, rubbing his eyes as the darkness of the dorm room pressed around him. Before he could even sit up, a loud banging echoed from the door.
“Nakajima! Get up! You’re throwing off my schedule by 47 seconds already!” Kunikida’s voice was unmistakable, laced with the kind of irritation only a man obsessed with punctuality could muster at this hour.
“I’m up, I’m up!” Atsushi called, scrambling out of bed. He fumbled for his duffel bag, already packed with essentials: clothes, a fake ID listing him as a 16-year-old transfer student named “Atsushi Fukuzawa,” and a burner phone provided by the agency. His heart raced—not from the mission, but from the sheer force of Kunikida’s impatience.
He yanked on a hoodie and sneakers, nearly tripping over his own feet as he grabbed his bag and stumbled to the door. Opening it revealed Kunikida, glasses glinting in the dim hallway light, his ideal notebook open and a pen tapping furiously against it.
“Do you have any idea how critical timing is for this operation?” Kunikida snapped, adjusting his glasses. “The government transport leaves the Yokohama border at precisely 4:15 AM. We’re cutting it close because you couldn’t wake up on time!”
“Sorry, Kunikida-san,” Atsushi mumbled, rubbing the back of his neck. “I’m ready now.”
Kunikida didn’t wait for further excuses. He grabbed Atsushi’s arm, practically dragging him down the stairs and out into the pre-dawn chill. The streets of Yokohama were eerily silent, the city’s usual vibrancy dulled by the hour. A sleek black car waited at the curb, its engine humming softly. Kunikida all but threw Atsushi into the passenger seat before sliding into the driver’s side.
“Buckle up,” Kunikida ordered, already pulling onto the road. “And don’t touch anything. The last thing I need is you breaking the car before we even reach the border.”
Atsushi clutched his bag, staring out the window as Yokohama’s skyline blurred past. The towering walls that separated the city from the rest of Japan loomed closer, their steel surfaces glinting faintly under the moonlight. His stomach churned with a mix of nerves and lingering doubt. *Fyodor’s still out there. What if I’m not here when he strikes?* But Fukuzawa’s words echoed in his mind: *We have everything under control.* He clung to that trust, forcing himself to focus on the mission ahead.
The car screeched to a stop at the Yokohama border, a heavily guarded checkpoint bristling with armed sentries and surveillance drones. Kunikida glanced at his watch, muttering under his breath about being “exactly 1 minute and 12 seconds ahead of schedule.” He turned to Atsushi, his expression softening just a fraction.
“You’ve got this, Atsushi. Stick to the cover story, don’t reveal your ability unless it’s life-or-death, and report back regularly. The agency’s counting on you.”
Atsushi nodded, gripping the strap of his bag. “I won’t let you down.”
Before Kunikida could respond, a pair of black SUVs rolled up, their tinted windows hiding the occupants. The doors opened, and two government agents in crisp suits stepped out. Their faces were unreadable, but their posture screamed authority. One of them, a woman with a sharp bob and a clipboard, approached.
“Atsushi Nakajima?” she asked, her tone clipped.
“That’s me,” Atsushi replied, stepping out of the car.
She glanced at Kunikida, who handed over a folder of documents without a word. “Everything’s in order,” she said after a brief inspection. “Come with us. We’ll escort you to Musutafu.”
Atsushi cast one last look at Kunikida, who gave a curt nod. “Good luck,” Kunikida said, then turned back to the car, already checking his schedule.
As Atsushi climbed into the SUV, the weight of leaving Yokohama settled over him. The city’s walls faded into the distance as the vehicle sped toward the unknown—a world of heroes, Quirks, and a traitor hiding in plain sight at U.A. High School.
The SUV hummed along the highway, cutting through the early morning mist as it left Yokohama’s fortified borders behind. Atsushi Nakajima sat in the back, his duffel bag clutched tightly in his lap, the government agent driving in silence. The other agent, the woman with the sharp bob, occasionally glanced at him through the rearview mirror, her expression unreadable. Atsushi’s nerves buzzed, but he kept his focus on the mission: infiltrate U.A. High School, find the traitor, and keep his true identity—especially his weretiger ability—under wraps. The fake ID in his pocket listed him as “Atsushi Fukuzawa,” a 16-year-old transfer student with a minor transformation Quirk. He repeated the cover story in his head, trying to quell the anxiety gnawing at him.
After a few hours, the skyline of Musutafu came into view, its towering hero agencies and bustling streets a stark contrast to Yokohama’s insular calm. The SUV pulled up to the imposing gates of U.A. High School, its high walls and advanced security systems gleaming under the morning sun. Atsushi stepped out, his breath catching at the sight of the legendary academy. This was where heroes were forged, a place he’d only glimpsed in grainy news clips smuggled into Yokohama.
Waiting at the gate were three figures: a towering man with a skeletal frame and wild blond hair, a disheveled man with dark hair and a scarf wrapped around his neck, and a small, white-furred creature in a suit that could only be Principal Nezu. Atsushi’s eyes widened slightly—*that’s All Might, the Symbol of Peace!*—but he quickly schooled his expression, remembering his role.
The female agent handed Nezu a sealed envelope, likely containing Atsushi’s forged documents, and gave a curt nod before returning to the SUV. With a low rumble, the vehicle departed, leaving Atsushi alone with the U.A. staff. He took a deep breath, flashed a shy smile, and stepped forward.
“Uh, hi,” he began, bowing slightly. “I’m Atsushi Fukuzawa, the transfer student. It’s an honor to be here.” His voice was polite, tinged with a nervous energy that made him sound younger than his 19 years. He glanced at the trio, his golden eyes bright with curiosity. “Sorry if I stare a bit—I’ve only seen people like you on TV. Heroes, I mean. It’s… kind of surreal.”
Nezu’s sharp eyes studied Atsushi, his whiskers twitching with surprise. The principal had prepared for a detective from Yokohama to be a cold, calculating operative—perhaps a brooding loner shaped by a city rumored to be a den of villains, where abilities like Atsushi’s supposed “tiger transformation Quirk” were wielded with ruthless precision. Instead, the boy before him was… kind. Shy, even, with a disarming sincerity that radiated from his earnest smile. There was a hint of sass in his tone, though, a spark that suggested he wasn’t entirely a pushover. *Fascinating,* Nezu thought, his curiosity about Yokohama deepening.
“Well, young Fukuzawa, welcome to U.A.!” Nezu said, his voice chipper but laced with keen interest. “I must say, you’re not quite what I expected. Yokohama’s reputation paints a rather… intense picture.”
Atsushi scratched the back of his neck, chuckling nervously. “Yeah, I get that a lot. Yokohama’s not all bad, though. It’s just… different.” He caught himself before saying too much, remembering Fukuzawa’s warning to keep the city’s secrets guarded.
All Might, despite his frail appearance, offered a warm smile. “It’s a pleasure to meet you, young man! Your willingness to help us speaks volumes. I’m Toshinori Yagi, though you might know me as All Might.”
Atsushi’s eyes sparkled briefly before he caught himself staring. “Sorry! It’s just—you’re *All Might*. I didn’t expect to meet you in person.”
The dark-haired man, Shota Aizawa, crossed his arms, his expression skeptical. “Don’t get starstruck,” he said gruffly. “You’re here to work, not gawk. I’m Aizawa, Class 1-A’s homeroom teacher. I’ll be keeping an eye on you.”
Atsushi nodded quickly, sensing Aizawa’s wariness. “Understood, sir. I’ll do my best to help.”
Nezu clapped his paws together. “Excellent! Let’s walk and talk. We’ll show you where you’ll be staying.” The group began moving toward the campus, Atsushi trailing slightly behind, his gaze darting to the towering dorms and training fields. Everything was so *open* compared to Yokohama’s tightly controlled streets.
As they walked, Nezu explained the situation. “We’ve had breaches in security—information leaks that suggest someone within U.A. is working against us. Your role is to blend in as a student, observe, and report anything suspicious. You’ll attend classes with Class 1-A, but you’ll report directly to us. Discretion is paramount.”
Atsushi nodded, his mind racing. Posing as a student would be tricky, especially with Aizawa’s sharp eyes on him. “I’ll keep that in mind. Anything specific I should look for?”
“Patterns,” Aizawa said curtly. “Unusual behavior, students or staff acting out of character, or unexplained absences. You’re a detective, right? Figure it out.”
Atsushi’s lips twitched into a small, sassy smile. “I’ll manage, don’t worry. I’m used to tricky cases.”
Aizawa raised an eyebrow but said nothing, though Nezu chuckled softly. “I like your spirit, Fukuzawa! Now, about your accommodations—given the sensitive nature of your mission, you won’t be staying in the student dorms.”
Aizawa cut in, his tone flat. “You’ll be in the teachers’ dorms, next to my room. I don’t trust an outsider from Yokohama living with my students. No offense.”
“None taken,” Atsushi replied, his smile unwavering despite the sting. He understood Aizawa’s caution—Yokohama’s reputation wasn’t exactly glowing, and his cover as a Quirk user was flimsy at best. “I’ll keep out of trouble.”
They reached a sleek, modern building adjacent to the main campus—the teachers’ dorms. Nezu gestured to a door on the second floor. “This will be your room. It’s modest but comfortable. Aizawa’s room is to your left, so don’t expect to sneak out unnoticed.”
Aizawa’s eyes narrowed slightly, but Atsushi just nodded. “Got it. I’ll settle in and start tomorrow, right?”
“Correct,” Nezu said. “You’ll join Class 1-A in the morning. We’ve informed the students you’re a late transfer with a minor transformation Quirk—something about enhanced agility, to keep it vague. Stick to that story.”
Atsushi gave a thumbs-up, his shy demeanor giving way to a flicker of confidence. “I can handle vague. Thanks for the welcome, Principal Nezu, Mr. Yagi, Mr. Aizawa. I’ll do my best not to let you down.”
As the adults dispersed—Nezu to his office, All Might to a meeting, and Aizawa lingering to shoot Atsushi one last scrutinizing look—Atsushi entered his new room. It was small but tidy, with a bed, a desk, and a window overlooking U.A.’s training grounds. He set his duffel bag down, his mind already spinning with questions. Who was the traitor? How would he navigate a school full of Quirks without revealing his ability? And what would the students of Class 1-A make of a “Quirkless” kid from a city they’d only heard rumors about?
For now, he pushed those thoughts aside, flopping onto the bed with a sigh. Tomorrow, the real mission began.
Atsushi Nakajima—now Atsushi Fukuzawa in this foreign world of heroes—pushed open the door to his assigned room in the teachers’ dorms with a soft sigh of relief. The space was compact but functional, a far cry from the shared dorm back in Yokohama with its familiar clutter and the faint sounds of Kyouka practicing her koto in the evenings. Here, the walls were a neutral beige, the bed neatly made with crisp white sheets, and a single window overlooked the sprawling U.A. campus, where distant figures of students could be seen jogging or practicing their Quirks under the afternoon sun. A small desk sat against one wall, flanked by a wardrobe and a nightstand. It felt temporary, like a hotel room, which suited Atsushi just fine. He wasn’t here to stay.
Dropping his duffel bag onto the bed, Atsushi fished out his phone from his pocket. The device was a Yokohama special—encrypted by Tanizaki’s ability to evade any outside surveillance, or so he hoped. He snapped a quick photo of the room: the unadorned bed, the empty desk, the view of the training grounds outside. With a few taps, he sent it to the ADA group chat, the one labeled “Agency Shenanigans” that Dazai had insisted on naming despite Kunikida’s protests.
**Atsushi:** [Photo attached] Made it to U.A. The room’s kinda plain, but it’s fine. One of the staff already doesn’t like me—Mr. Aizawa, the homeroom teacher. He’s got this intense stare, like he’s sizing me up for a fight. Guess Yokohama’s rep precedes me. Everything okay back there?
He hit send and leaned against the desk, waiting for the replies. The group chat lit up almost immediately, the familiar pings a comforting reminder that he wasn’t entirely alone in this quirk-filled madness.
**Dazai:** Oh, Atsushi-kun! Already making enemies? That’s my boy. 😏 Tell me, is Aizawa the scruffy one with the scarf? I bet he’d make a great double suicide partner—looks like he’s one bad day away from jumping off a bridge himself.
**Ranpo:** Boring room. Needs snacks. Did you pack any? If not, you’re doomed. Heroes probably eat protein bars or something lame. Update on the traitor: nothing yet, but I’ll crack it from here if you mess up.
**Kunikida:** Nakajima, focus on the mission. Do not engage in frivolous texting. And remember to study those books I gave you. Yokohama’s isolation means you’re behind on standard Japanese hero history and cultural norms. Deviate from schedule, and I’ll know.
**Yosano:** Aw, the room looks cozy enough. Eat the onigiri I packed—it’s got extra nutrients to keep your tiger side in check. Don’t push yourself too hard, kid. If anyone gives you trouble, just say the word; I’ll “heal” them. 💉
**Kyouka:** Be safe. Miss you already. Demon Snow says hi.
**Kenji:** Wow, Atsushi-san! That view looks fun! Are there farms nearby? Bet the heroes grow super veggies with their powers. Eat well!
**Tanizaki:** If you need any illusions for cover, let me know. Naomi says hi and to bring back hero merch if you can.
Atsushi couldn’t help but smile, a genuine warmth spreading through him as he read the messages. It was chaotic, just like the agency—Dazai’s teasing, Ranpo’s bluntness, Kunikida’s sternness, Yosano’s maternal edge, Kyouka’s quiet concern, Kenji’s optimism, and Tanizaki’s helpfulness. Even without Fukuzawa chiming in (he rarely did in group chats, preferring direct calls), it felt like home.
**Atsushi:** Thanks, everyone. Dazai-san, no suicides here—too many heroes around to save you. Ranpo-san, I’ll grab snacks tomorrow. Kunikida-san, I’ll study, promise. Yosano-sensei, onigiri sounds perfect right now. Kyouka, miss you too—hug Demon Snow for me. Kenji, no farms, but the campus is huge. Tanizaki-san, might need that illusion trick later. Everything’s under control so far. No sign of the traitor yet, but I’ll keep eyes open.
**Dazai:** Good luck, tiger cub. Don’t let the heroes brainwash you into wearing capes. We need you back in one piece.
**Ranpo:** Capes are dumb. Solve the case quick so I don’t have to.
**Kunikida:** End chat. Mission priority.
Atsushi chuckled softly, pocketing his phone after a final thumbs-up emoji. The brief exchange had lifted his spirits, grounding him amidst the uncertainty. But now, it was time to settle in. He unzipped his duffel bag, the zipper’s rasp echoing in the quiet room. First out were his clothes—a few simple shirts, pants, and a jacket, all nondescript to blend in as a student. He hung them in the wardrobe, noting how the hangers clinked softly against the metal rod. The fabric smelled faintly of Yokohama’s sea air, a subtle reminder of the port city’s salty breeze that he already missed.
Next, he pulled out the stack of books Kunikida had insisted on. They were thick, academic tomes: “A Comprehensive History of Quirks in Modern Japan,” “Hero Society: Laws, Ethics, and Cultural Impacts,” and “Musutafu Regional Studies: From Dawn of Quirks to Present.” Atsushi groaned inwardly as he stacked them on the nightstand. Yokohama’s education system had always dismissed Quirks as “outsider nonsense,” focusing instead on literature, abilities, and the city’s self-contained history. He knew the basics from smuggled media, but details like the All Might era or the HPSC’s structure were foggy at best. *Kunikida-san’s right,* he thought, flipping through one absentmindedly. *I need to catch up or I’ll stick out like a sore thumb.*
Setting the books aside, Atsushi retrieved his laptop—a sleek, agency-issued model with encrypted drives—and placed it on the desk. He plugged it in, the soft hum of the fan starting up as he arranged a couple of blank notebooks beside it, ready for jotting down observations about potential suspects. The desk lamp flickered on with a click, casting a warm glow over the setup. It looked almost studious, like he was preparing for exams rather than espionage.
Finally, he dug deeper into the bag and pulled out the onigiri Yosano had wrapped for him—a rice ball stuffed with pickled plum, sealed in plastic with a little note: “Stay sharp, kid. -Y.” Smiling, Atsushi unwrapped it and took a bite, the tangy flavor bursting on his tongue. He savored it slowly, leaning back in the chair as he powered on the laptop. The screen lit up, and after entering his secure password, he opened a browser—carefully routed through Yokohama proxies to avoid tracing.
His fingers danced over the keys, pulling up searches on U.A.‘s heroes and staff. “All Might biography,” he typed first, scanning articles about the Symbol of Peace’s legendary battles and his recent retirement. *He’s thinner in person,* Atsushi mused, chewing thoughtfully. Next: “Shota Aizawa Quirk.” Results detailed Eraser Head’s ability to nullify Quirks with a stare, his underground hero status, and his no-nonsense teaching style. *That explains the suspicion,* Atsushi thought. *He probably erases Quirks on instinct.* He delved deeper, researching Principal Nezu’s enigmatic past—rumors of experiments, super intelligence—and then Class 1-A’s students: Midoriya’s One For All, Bakugo’s explosions, Todoroki’s dual elements. Pages flew by as he took mental notes, the onigiri disappearing bite by bite. It was fascinating, this world of flashy powers and public heroism, so different from Yokohama’s shadowy abilities and detective work.
Little did Atsushi know, his every move was under scrutiny. Hidden in the room’s corners—camouflaged in the light fixture, the air vent, and even the desk lamp—were state-of-the-art cameras and microphones, installed by U.A.‘s security team at Nezu’s behest. Access was restricted to a select few: Nezu himself, All Might, and Shota Aizawa. At that moment, in his own adjacent room, Aizawa sat hunched over a monitor, his capture scarf draped loosely around his neck, a mug of black coffee steaming beside him. His bloodshot eyes, ever vigilant, flicked across the split-screen feed, audio humming softly through headphones.
Aizawa had volunteered for the first watch, his distrust of the Yokohama outsider running deep. Yokohama was a black box—a city of rumored villains, mafia syndicates, and unregulated “abilities” that sounded suspiciously like illegal Quirks. Sending a kid who could supposedly turn into a tiger? It screamed red flags. *Nezu’s too curious for his own good,* Aizawa thought, sipping his coffee bitterly. *Letting a potential spy into our midst just to ‘meet a real Yokohama person.’ If this Fukuzawa kid slips up, I’ll erase whatever ‘Quirk’ he’s hiding and send him packing.*
He watched as Atsushi sent the text, the camera’s high-res capturing the phone screen clearly. The group chat names and messages scrolled by—Armed Detective Agency? Dazai, Ranpo, Kunikida… unfamiliar, but the banter seemed innocuous, almost familial. *Not villains, then? Or a front?* Aizawa’s brow furrowed. The kid’s smile was genuine, shy even, as he replied. No coded language that he could detect, just casual check-ins. *He’s homesick already. Interesting. Not the hardened operative I expected.*
As Atsushi unpacked his clothes, Aizawa leaned closer, noting the simplicity of the garments—no hidden weapons, no gadgets. *Clean. Too clean?* Then the books emerged, and Aizawa’s interest piqued. He zoomed in on the titles, recognizing them as standard hero studies texts. *Catch-up reading? Yokohama must really be isolated if he needs basics like this. Or is it a ploy to seem ignorant?* He grunted softly, rubbing his stubbled chin. The kid flipped through one, his expression one of mild reluctance rather than scheming intent. *Looks like a student cramming for a test. Harmless… for now.*
The laptop setup drew a sharper gaze. Aizawa’s fingers hovered over his keyboard, ready to flag any suspicious activity. But as Atsushi arranged the notebooks and plugged in, it was all mundane. *No immediate hacks. Good.* Then the onigiri—such a simple snack, unwrapped with care, the note briefly visible. *Yosano? Doctor, maybe? He’s eating like he hasn’t had a meal in hours. Kid’s skinny; Yokohama must not feed them well.* Aizawa’s thoughts drifted to his own students, how he’d nag them about nutrition during training. *Not my problem. Focus, Shota.*
When Atsushi began researching, Aizawa’s suspicion flared anew. The searches were targeted: All Might, himself, Nezu, the class. *Reconnaissance. Smart, but obvious.* He watched Atsushi’s face—wide-eyed curiosity, not malice—as he scrolled through bios and battle footage. The kid leaned forward, onigiri crumbs on his shirt, murmuring notes to himself. *He’s… intrigued? Like a fanboy discovering heroes for the first time. Yokohama rumors say they hate us, call heroes ‘silly.’ But this kid’s absorbing it all. Shy, honest, a bit sassy earlier at the gate. Doesn’t fit the brooding villain profile.*
Aizawa leaned back, crossing his arms. Hours could pass like this, but for now, the feed showed nothing incriminating. *Maybe Nezu’s right. Maybe he’s just a detective doing a job.* But doubt lingered, a shadow in Aizawa’s mind. Yokohama’s isolation bred secrets, and trust wasn’t given lightly. *I’ll watch. If he steps wrong, tiger or not, he’s out.* The monitor glowed on, capturing Atsushi’s quiet diligence as the afternoon waned into evening.
The soft glow of the laptop screen bathed Atsushi Nakajima’s face as he hunched over the desk in his temporary U.A. room, the clock on the wall ticking past 2:00 AM. Pages of hero profiles, battle analyses, and student dossiers flickered across the screen, each one a puzzle piece in the enigma of U.A.’s traitor. He’d started with the heavy tomes Kunikida had forced him to bring, skimming chapters on the history of Quirks and the rise of hero society. The words blurred together after a while—All Might’s debut, the HPSC’s formation, the cultural shift toward hero worship—but Atsushi powered through, jotting notes in one of his notebooks. His pen scratched softly, the only sound in the quiet room save for the occasional creak of the chair as he shifted.
His golden eyes, heavy with exhaustion, lingered on a profile of Izuku Midoriya, the green-haired student rumored to be All Might’s successor. One For All… sounds like something Dazai-san would overanalyze for fun, Atsushi thought, a faint smile tugging at his lips. But the weight of his mission pressed down on him. If Midoriya’s the traitor, it’d be a huge blow to U.A. But he doesn’t seem the type… He flipped to another page in the book, then back to the laptop, cross-referencing Katsuki Bakugo’s explosive Quirk with a news article about a recent villain attack. His head nodded forward, the onigiri long gone, crumbs scattered across the desk. By the time his eyelids fluttered shut, Atsushi’s cheek was pressed against the open book, his breathing slow and even.
In the adjacent room, Shota Aizawa sat at his own desk, the surveillance feed casting a dim light on his tired features. He’d been watching the boy from Yokohama since he’d settled in, his coffee mug now cold and forgotten. Kid’s dedicated, I’ll give him that, Aizawa thought, his eyes narrowing as Atsushi pored over the research. The boy’s diligence was almost obsessive, not unlike Midoriya’s own note-taking habits. But is it genuine, or is he building a dossier to feed back to Yokohama? Aizawa’s fingers tapped the desk, his capture scarf coiled loosely around his shoulders. The cameras caught everything: the way Atsushi muttered to himself, the occasional yawn, the earnest scribbling. No encrypted messages, no hidden tech. Just a kid studying. When Atsushi finally slumped over, asleep at the desk, Aizawa grunted softly. He’s burning himself out already. Rookie mistake. He considered waking the boy but decided against it. Let him crash. If he’s late tomorrow, it’ll be a lesson.