Section 1: The Classroom Return
Momo stepped into the classroom, her polished black shoes tapping softly against the floor, each step as precise and deliberate as her carefully composed demeanor. The lively hum of chatter faded slightly as her presence registered with her classmates. She felt their eyes flicker toward her—not in hostility but in concern. She noticed the subtle glances toward Yui as she followed a few paces behind.
The change in Yui was impossible to miss. She walked with a confidence that seemed to command the space around her, her sharp gray eyes scanning the room like a hawk. Her movements were calculated, her expression unreadable, and her aura sent an almost tangible shiver through the air.
"Yaoyorozu, Kodai!" Mina Ashido's voice broke through the awkward tension, her pink skin and ever-cheerful demeanor brightening the atmosphere like a ray of sunshine. "How are you guys holding up? We heard about your mom, Yui. Is she okay?"
Yui's face betrayed no emotion as she answered. "She's stable."
Mina shifted on her feet, the weight of Yui's tone clearly unsettling her. "That's… that's good to hear. I hope she recovers soon."
"Thanks," Yui said curtly, moving past her without a second glance. She slid into her seat with an air of finality that discouraged further conversation.
Momo lingered, her lips pressing into a faint line. She turned to Mina, trying to soften the tension. "Thank you for asking, Mina. It's been a tough time for all of us, but we're managing."
Mina smiled warmly, but her gaze darted to Yui. "She's… different."
Momo sighed. "It's been hard on her."
A Class on Edge
As Momo took her seat, the room's energy shifted once again. Kirishima leaned over to Bakugo, whispering something that earned a sharp glare and a muttered "Shut up" from the explosive blonde. Bakugo's shoulders were rigid, his usual bravado replaced with a tension that radiated off him in waves.
Momo noticed it immediately. Bakugo's body language screamed unease—something entirely uncharacteristic of the boy who usually thrived on confrontation. Her brows furrowed as she leaned toward him.
"Are you okay?" she asked softly.
Bakugo's glare snapped to her, but there was something off about it. The fire was there, but it was dimmed, muted by something that lurked beneath the surface. He didn't answer, just grunted and turned away.
Momo straightened in her seat, her unease growing. Bakugo was many things—arrogant, loud, brash—but he was never quiet. Never subdued.
Yui's Silence
Across the room, Yui sat motionless, her hands resting on the desk in front of her. She didn't fidget or glance around like the other students. She simply sat there, her gray eyes fixed ahead as if she were looking through the walls and into some distant horizon.
Her presence felt heavier than it should. The air around her seemed to thrum with an unspoken intensity, like a predator lying in wait.
Momo watched her cousin out of the corner of her eye, her heart sinking further. What's happened to you, Yui? she thought. Where is the girl I grew up with?
Questions from Classmates
The classroom door slid open with a faint creak, and Aizawa shuffled in, his perpetually disheveled appearance met with respectful silence from the class. He carried the same tired expression as always, though his sharp eyes swept the room, lingering for just a moment on Yui before moving on.
"All right," he said, his voice a monotone drawl. "Settle down."
The students straightened in their seats, the murmur of conversation fading.
Aizawa leaned against the desk at the front of the room, his hands stuffed into his pockets. "Before we get started, I assume you've all heard about what happened to Kodai's mother. Let's keep things professional and focus on the lessons. If you have personal questions, save them for after class."
There was a collective nod from the students, though Momo noticed a few lingering glances directed at Yui. She braced herself as Mina leaned over again, whispering in her ear.
"Hey, Momo," Mina said softly. "I didn't know Yui was your cousin until yesterday. She's… intense. Has she always been like that?"
Momo hesitated, her mind racing for a response. "She's been through a lot," she said finally, hoping the vague answer would satisfy her.
"Yeah, I guess," Mina said, though her curiosity clearly wasn't quelled. "She's really strong, though. Like, scary strong."
Momo forced a small smile. "She's always been determined."
An Unspoken Divide
As Aizawa began the lesson, Momo couldn't help but steal glances at Yui. Her cousin's transformation was undeniable, and it weighed heavily on her heart. The Yui she had grown up with—the girl who had always been in her shadow, who had struggled to find her place in the family—was gone. In her place was someone colder, sharper, and undeniably powerful.
Momo's thoughts churned as she tried to reconcile the cousin she knew with the one sitting across the room. What happened to you, Yui? What changed?
Her thoughts were interrupted by Aizawa's sharp voice cutting through the classroom. "Yaoyorozu. Kodai. Pay attention."
"Yes, sir," Momo said quickly, straightening in her seat. She glanced at Yui, who hadn't reacted at all to being called out.
The class continued, but Momo's unease lingered, growing heavier with every passing moment.
Section 2: The Battle Trial Begins
The classroom buzzed with an electric energy as Aizawa finished the lecture and gestured toward the door. "All Might is waiting for you all at Grounds Beta. Change into your hero costumes and get ready for your next trial."
A wave of excitement rippled through the room, students quickly gathering their things and heading toward the changing rooms. Momo couldn't help but notice how Yui moved—silent, deliberate, and strangely detached. It was as though the frenzy of energy from the other students barely touched her.
As they walked toward the lockers, Mina and Jirou sidled up to Momo.
"So, what's going on with Yui?" Mina asked, her voice low enough not to carry to the others. "She's your cousin, right?"
Jirou nodded, her hands tucked into her pockets. "Yeah, she's got this… vibe about her. Like she's sizing everyone up."
Momo hesitated, glancing toward Yui, who was walking ahead of them. "She's been through a lot recently," she said carefully. "Her mother's accident… it's been hard on her."
"Hard on her?" Mina whispered, her voice tinged with disbelief. "She doesn't seem shaken. She seems… terrifying."
Jirou shrugged. "Whatever it is, she's strong. I mean, she crushed the quirk tests. Even Bakugo seems wary of her, and that says something."
Momo glanced at Bakugo, who was walking several paces behind them, his hands shoved deep into his pockets. He was glaring at the floor, his usual fiery energy subdued. She hadn't missed how he'd stiffened earlier when Yui entered the room.
Mina nudged her. "Is she always like this?"
Momo sighed. "No. She's… different now. I don't know how to explain it."
Ground Beta: The Trial Setup
When the class arrived at Grounds Beta, All Might was already waiting, his larger-than-life presence instantly commanding their attention. His signature grin was firmly in place as he stood before them, his cape billowing dramatically in the wind.
"WELCOME, CLASS 1-A!" he bellowed, his voice echoing across the training ground. "Today, we'll be conducting a battle trial! This is your chance to put your quirks and teamwork to the test!"
The students murmured excitedly, exchanging glances as All Might continued. "The trial will be an indoor battle. You'll be split into teams of two: one team will play the heroes, and the other will be the villains. The villains will guard a nuclear core they intend to deploy, while the heroes must stop them! If the heroes capture the villains or secure the core, they win. If the villains guard the core for the full duration or capture the heroes, they win."
He reached into a box and held up a series of numbered balls. "Team pairings will be determined by lottery!"
The Pairings
One by one, the students drew their numbers, the pairings quickly forming.
Momo's heart sank slightly when her number was called. "Yaoyorozu and Bakugo: Team Heroes."
She glanced toward Bakugo, whose jaw tightened as he stared down at his slip of paper. He didn't look at her.
"Tokoyami and Kodai: Team Villains!" All Might announced, and Momo felt her stomach twist.
Yui's expression didn't change as she stepped forward to join Tokoyami, her movements as composed and silent as ever. The contrast between her and Tokoyami was striking—while Tokoyami's dark shadow swirled ominously around him, Yui radiated a chilling stillness that was somehow more unsettling.
Momo glanced at Bakugo, who finally raised his head. His face was pale, his usual sneer absent. "This is bad," he muttered under his breath.
"What do you mean?" Momo asked, frowning.
Bakugo's red eyes darted toward Yui before quickly looking away. "You'll see."
Hero Costumes and Preparations
The class dispersed to change into their hero costumes, the excitement bubbling back up among the students. For some, this was their chance to shine, to show what they were capable of. For others, it was a test of survival.
Momo emerged in her sleek crimson and gold costume, the metallic accents gleaming in the sunlight. She adjusted the straps on her utility belt, her mind already whirring with potential strategies.
Bakugo was waiting for her near the entrance to the training ground, his signature grenadier gauntlets strapped securely to his arms. His face was tense, his lips pressed into a thin line.
"We need a plan," Momo said as she approached him.
Bakugo snorted, though it lacked its usual fire. "A plan? Against her? Good luck with that."
Momo frowned. "You're acting like she's invincible."
"She might as well be," Bakugo muttered, his hands flexing. "You don't know what she's capable of."
"Then tell me," Momo pressed. "What happened between you two?"
Bakugo's eyes flicked toward Yui, who was now standing with Tokoyami on the other side of the training ground. She was clad in her modified costume, a menacing blend of sleek black and crimson that seemed to blend seamlessly with the shadows. The long, tattered cape that flowed behind her moved like smoke, and her sharp gray eyes glinted beneath her mask.
"Let's just say she's not the same person you think she is," Bakugo said, his voice low. "And if we're not careful, she'll tear us apart."
Villains' Strategy
Inside the mock villain hideout, Yui and Tokoyami prepared for the trial. The room was dimly lit, the shadows dancing across the walls as Dark Shadow swirled protectively around his master.
Yui held the "nuclear core" in her hands, a device about the size of a barrel. Her quirk activated, and the core shrank to the size of a soda can, fitting neatly into her palm.
"They'll come for this," Yui said, her voice calm. "But they'll never find it."
Tokoyami watched her carefully. "What's the plan?"
Yui slipped the miniature core into a hidden pocket in her costume. "You and Dark Shadow will hold the choke point. I'll take care of the rest."
Tokoyami hesitated. "Take care of them? You mean—"
"They won't get past me," Yui said, her voice cold. "Not Bakugo. Not Momo. No one."
The Heroes Enter
The trial began, and Momo and Bakugo moved cautiously through the building's labyrinthine halls. The air was thick with tension, the dim lighting casting eerie shadows that seemed to reach for them as they passed.
"This place is a nightmare," Momo whispered, her sharp eyes scanning every corner. "We need to be careful."
Bakugo didn't respond. His hands were already sparking, his posture tense and coiled like a spring.
"What's the plan?" Momo asked, trying to keep her voice steady.
"Take out Tokoyami first," Bakugo said. "Dark Shadow can't handle my explosions. Once he's down, we deal with her."
Momo nodded, though her unease lingered. She couldn't shake the feeling that they were walking into a trap.
Section 3: A Predator in the Shadows
The air inside the mock building was suffocating, thick with the scent of damp concrete and faintly metallic like rusting iron. The flickering fluorescent lights overhead gave off a buzzing hum that crawled under Momo's skin, each flicker casting jagged shadows across the labyrinthine halls. Every corner felt alive, the shadows twisting and stretching as though something unseen was lurking within.
"This place reeks," Bakugo muttered, his voice low and tense, but the sharp edge of his usual bravado was missing. His explosions crackled faintly in his palms, the orange light dancing in the dark corridor. "And I don't just mean the smell."
Momo adjusted her utility belt, her sharp eyes scanning the hallway ahead. The silence was unnerving, a stillness so absolute it felt oppressive. "What do you mean?" she asked softly.
Bakugo's eyes darted around, his jaw clenched tight. "She's here. Watching. Waiting. She doesn't fight head-on."
"Yui?" Momo asked, her voice tinged with disbelief. "She's not like that. She's strategic but—"
"She's a goddamn monster," Bakugo hissed, cutting her off. "You don't get it, do you? That's not the same girl you grew up with. She's... something else now."
Momo frowned, glancing at him. "You're overreacting."
Bakugo stopped abruptly, his glare cutting through her. "Am I? You'll see soon enough."
The Shadows Stir
From her perch high above, Yui Kodai crouched on a steel beam, her body shrouded in darkness. Her enhanced senses zeroed in on the faintest noises—Bakugo's low growl, the creak of Momo's gear, the sharp intake of breaths. They were like prey wandering blindly into her domain, their every move betraying their presence.
The corners of her lips curled into a wicked smile beneath her mask. They don't even know how close I am.
Her heart thrummed with a steady rhythm, perfectly in sync with the building's faint vibrations. She tapped her gloved fingers lightly against the steel beam, the sound imperceptible to anyone but her. Her body felt like it belonged to the shadows, fluid and silent, her every movement deliberate.
Let's make them sweat.
A Whisper in the Dark
As Bakugo and Momo rounded a corner, a sudden, low chuckle echoed through the halls, a sound so faint it might have been imagined. It reverberated like a ghostly whisper, threading through the cracks in the concrete walls.
Momo froze, her breath hitching. "Did you hear that?"
Bakugo's hands crackled with light. "Yeah. She's screwing with us."
"Are you sure it's not Tokoyami?" Momo asked, her voice tight.
Bakugo shook his head. "Dark Shadow doesn't play games like this. This is her."
The hallway ahead stretched into darkness, the flickering light from Bakugo's explosions barely piercing the oppressive gloom. The faint smell of ozone hung in the air, mingling with the metallic tang of fear that Bakugo couldn't suppress.
The chuckle came again, this time closer.
"Bakugo…" Momo's voice quivered slightly, her usual composure cracking.
"She's trying to split us up," Bakugo said, his voice low but steady. "Stay close. Don't let her mess with your head."
The Predator Strikes
Suddenly, a shadow darted across the hallway ahead, too fast to follow. Momo's breath caught in her throat, her hands instinctively moving to her utility belt.
"There!" she whispered, pointing.
But Bakugo shook his head, his red eyes narrowing. "No, that's not her. She's not that sloppy."
Before Momo could respond, the lights overhead buzzed louder and then died completely, plunging the hallway into pitch black. The silence that followed was deafening, broken only by the faint sound of Bakugo's shallow breathing and the soft rustle of Momo adjusting her equipment.
"Stay calm," Bakugo said, though his own voice wavered.
A voice drifted through the darkness, low and smooth, dripping with malice. "You should've stayed home, Bakugo. I told you what would happen if you crossed me again."
Bakugo's body stiffened, his explosions flaring to life and illuminating the hallway in bursts of orange. But the light only revealed more darkness, the shadows swallowing everything beyond a few feet.
"Show yourself, freak!" Bakugo roared, his voice trembling with anger and something else—fear.
Another chuckle, this one closer. "Why would I do that when you're so much fun to play with?"
The Attack
The sound of rushing air was the only warning before Yui struck. She emerged from the shadows like a phantom, her body twisting at an inhuman angle as she lunged at Bakugo. Her movements were impossibly fast, a blur of black and crimson that seemed to defy physics.
Bakugo barely had time to react, his explosion firing just as Yui's clawed glove caught his arm. The force of the blast lit up the hallway, revealing her mask for a brief second—its twisted, almost organic design gleaming in the light. Her gray eyes glowed with a predatory intensity, the kind of gaze that made Bakugo's blood run cold.
The explosion sent Yui flying back into the darkness, but her laughter echoed once again, chilling and unbroken. "That tickled."
Bakugo stared into the shadows, his chest heaving. "What the hell are you?"
Her voice came from behind him this time, a whisper in his ear. "Better than you."
He spun around, but there was no one there. Instead, the shadows seemed to close in, suffocating and alive, as though the darkness itself was her ally.
Momo's Realization
Momo had been frozen, her mind racing as she tried to process what she was seeing. This wasn't the Yui she knew. The girl who had struggled to keep up, who had been overshadowed by her family—this was something else entirely.
"Bakugo, we need to regroup," she said, her voice trembling.
"No kidding," Bakugo snapped, his hands sparking as he backed up toward her. "She's not human."
The shadows shifted again, and Momo caught a glimpse of Yui's cape trailing like smoke. Her heart pounded as she reached into her belt, pulling out a small device.
"Flashbangs," she whispered, her hands trembling slightly as she handed one to Bakugo. "Use them to disorient her. She's fast, but she's still human."
Bakugo snorted. "Human? Yeah, right."
Yui's Power
From her hidden perch, Yui watched as they scrambled. Her gray eyes glinted with amusement. They were like mice in a maze, their every movement predictable and futile. She tapped the miniature "nuclear core" in her pocket, smirking beneath her mask.
Let's see how long they last.
She darted into the hallway again, her movements fluid and silent. This time, she went for Momo, her claws slashing toward her. Momo barely dodged, rolling to the side and throwing a flashbang. The explosion of light lit up the hallway, and for a brief second, Yui's form was fully visible.
Her mask was cracked, revealing part of her face—and the chilling sight of her skin knitting itself back together. Momo's breath hitched, her heart hammering in her chest.
"Yui?" she whispered, her voice barely audible. "What happened to you?"
Yui tilted her head, her smile sharp and predatory. "I evolved."
The Fall of Bakugo
The air crackled with the acrid tang of Bakugo's explosions, but it was tainted—smothered by an oppressive weight that pressed down on him like an invisible vice. His breaths came in shallow, panicked gasps, the oxygen around him growing thinner with every step he took. Yui's voice echoed through the corridor, soft and venomous, as though she were right behind him.
"Running already, Bakugo?" Her words slithered through the air like a snake's hiss. "You were so confident a moment ago."
Bakugo gritted his teeth, his palms sparking weakly as he leaned against the crumbling wall of the mock building. The once-sturdy structure seemed to groan under its own weight, the support beams unnaturally thin and warped—Yui's handiwork. The ground beneath his boots felt unstable, shifting like quicksand as pebbles and fragments of concrete rolled across the floor.
"Damn it…" he muttered, his voice hoarse. His usual defiance was nowhere to be found, replaced by the raw edge of fear.
The lights above flickered and died, plunging the hallway into darkness. For a brief, fleeting moment, silence reigned, broken only by Bakugo's ragged breathing.
And then came the sound.
Soft footsteps, deliberate and measured, each one like a drumbeat echoing in his ears. They came from all directions, reverberating off the walls as if the very shadows were alive and moving.
Bakugo's heart pounded as he spun around, his hands flaring to life. The orange glow of his explosions revealed nothing but the empty corridor stretching endlessly in both directions. He was alone—or so it seemed.
"Where are you?!" he roared, his voice trembling despite his efforts to steady it. "Come out and fight, you coward!"
The Predator Emerges
A low chuckle rippled through the air, sending a shiver down Bakugo's spine. "Fight?" Yui's voice was calm, almost amused. "I don't fight, Bakugo. I hunt."
The words barely registered before the ground beneath Bakugo's feet shifted. The tiles warped and twisted, one of them snapping upward like the jagged edge of a tooth. Bakugo stumbled, his balance thrown off as the floor buckled and cracked around him.
He fired a blast at the ground to propel himself forward, but the explosion fizzled out with a pathetic pop. He gasped, clutching his chest as the air seemed to grow heavier, thicker. His lungs burned with every shallow inhale, the oxygen around him compressed into an almost suffocating density.
"You're nothing without your explosions," Yui's voice taunted, dripping with mockery. "A one-trick pony with no tricks left."
Bakugo stumbled against the wall, his vision blurring as he fought for breath. His palms sparked weakly, but the lack of oxygen rendered his quirk useless. Desperation clawed at his throat as he scanned the darkness for any sign of her.
A Monster From His Nightmares
And then he saw her.
At first, it was just a shadow—a vague shape in the corner of his eye. But as she stepped into the dim light, her form became clearer, and Bakugo's blood ran cold. She didn't look human. Her limbs were elongated, her joints twisting at unnatural angles as she moved with an eerie fluidity. Her mask had cracked further, revealing sharp teeth bared in a predatory grin.
To Bakugo, she wasn't Yui anymore. She was the monster from his nightmares, the one that had haunted him ever since the entrance exams. The one he thought he'd escaped.
"No…" he whispered, his voice barely audible. His hands trembled as he tried to ignite another explosion, but his palms only sparked faintly. "Stay back…"
Yui tilted her head, her gray eyes glowing faintly in the darkness. "What's wrong, Bakugo? Scared?"
Bakugo stumbled backward, his movements frantic as he tried to put distance between them. "Get away from me!"
She moved faster than he could react, her form blurring as she darted forward. Bakugo screamed, firing an explosion at point-blank range, but Yui twisted her body unnaturally, dodging the blast with ease. She was on him in an instant, her clawed glove slamming into his chest and sending him sprawling across the floor.
The Crushing Weight
Bakugo groaned as he tried to push himself up, but the ground beneath him shifted again. The air grew heavier, the weight pressing down on him like an invisible hand. His arms trembled as he struggled to lift himself, but it was like trying to push against a mountain.
"You don't even realize how weak you are," Yui said, her voice calm and measured as she walked toward him. She reached down and picked up a small pebble from the ground, holding it up for him to see.
Bakugo's eyes widened as the pebble began to grow, expanding in her hand until it was the size of a boulder. She tossed it toward him casually, and he barely managed to roll out of the way as it crashed into the ground with a deafening thud.
"You're just like this pebble," Yui continued, her tone almost conversational. "Small, insignificant, easy to crush."
Bakugo gritted his teeth, his fear giving way to anger. "Shut up!"
He forced himself to his feet, his explosions flaring weakly as he charged at her. But Yui was faster. She shrank herself to half her size in an instant, her speed doubling as she darted around him. Before he could react, she was behind him, her claws digging into his shoulder and slamming him into the wall.
The Final Blow
Bakugo gasped as the air was forced from his lungs. He tried to fight back, swinging his arm toward her, but she caught it effortlessly, her grip like a vise.
"You're pathetic," she said, her voice low and venomous. "All that bluster, all that rage… and for what? You're just a scared little boy pretending to be a man."
Bakugo growled, his body trembling as he struggled against her grip. "You don't know anything about me."
Yui's smile widened. "Don't I?"
She leaned in close, her gray eyes boring into his. "You'll never be strong enough, Bakugo. Not against me. Not against him."
Bakugo froze, his eyes widening. "Him…?"
But Yui didn't give him a chance to respond. She tightened her grip, slamming him into the ground with enough force to crack the tiles beneath him. He groaned weakly, his vision fading as darkness crept in around the edges.
As he lost consciousness, the last thing he saw was Yui standing over him, her form looming like a shadowy specter.
Yui's Next Target
Yui straightened, brushing the dust from her gloves as she turned her gaze down the hallway. The air was still heavy, the building groaning under the strain of her quirk. She could sense Momo nearby, her cousin's presence like a faint ember in the distance.
With a smile that didn't reach her eyes, Yui began to walk, her footsteps echoing softly through the corridor. She didn't rush. There was no need. Momo would come to her soon enough.
"Your turn, Momo," she whispered, her voice carrying through the darkness like a ghostly wind.
The predator was still hunting.
The Hunt Begins
Momo's back pressed against the cold steel wall of the mock building, her breath shallow and silent. Her chest rose and fell as she fought to steady herself, her mind racing like a storm-tossed sea. The flickering fluorescent lights above her cast sporadic, trembling shadows that seemed to mock her fear.
She peeked around the corner and caught a glimpse of Yui's silhouette. The shadowy figure moved with an unnatural grace, her limbs twisting at angles that defied logic. Every step Yui took seemed deliberate, calculated—a predator tracking its prey. Momo's stomach twisted, and for a moment, she thought she might be sick.
Bakugo's crumpled form flashed in her mind, the brutal way Yui had reduced him to nothing more than a broken doll. That wasn't a battle; it was a massacre. The Yui she had grown up with—the Yui who had once trailed behind her, struggling to keep up—was gone. This was someone, something, entirely different.
Her fingers tightened around the flashbang she had created moments earlier. Think, Momo. Think. You can't overpower her, not like Bakugo tried to. You have to outsmart her.
The Predator's Voice
The sound of Yui's voice echoed through the hall, soft and venomous, sending chills down Momo's spine. "Momo, Momo, Momo," Yui called, her tone sing-song but dripping with malice. "You're always the clever one, aren't you? Always the favorite."
Momo bit her lip, refusing to respond. She knew better than to give away her position.
"You can't hide forever," Yui continued, her footsteps slow and deliberate. "And even if you could... it wouldn't change anything. I'm better now. Stronger. Smarter. You'll see soon enough."
The sound of her voice was everywhere, amplified by the acoustics of the building. Momo couldn't pinpoint where it was coming from. Her heart pounded as she crouched lower, clutching her utility belt for comfort.
Setting the Trap
I can't beat her in a straight fight, Momo thought, her mind racing. But she's unstable. If I can get inside her head, throw her off her game…
A plan began to form, and she reached into her belt, activating her quirk. With precision and speed, she began creating: a set of sticky bombs designed to immobilize her target, nets reinforced with durable metal alloys, and—most importantly—light projectors.
She placed the projectors strategically throughout the corridor, their sleek designs reflecting her meticulous attention to detail. When activated, they would display holographic images—memories from Yui's past that Momo knew all too well. Moments of humiliation, of disappointment, of rejection.
This Yui might be faster and stronger, but her mind... it's fragile. And I know how to exploit that.
The First Encounter
Yui turned the corner, her eyes scanning the hallway. The dim light made her shadow stretch unnaturally, twisting and curling along the walls like living tendrils. She tilted her head, a faint smile playing on her lips.
"Where are you, Momo?" she called, her voice sweet but edged with steel. "Hiding isn't like you. Did I scare you that much?"
Momo pressed a button on her belt, activating the first projector. A beam of light shot out from a hidden corner, casting an image onto the wall. It was a memory—one of Yui standing in her family's living room, her mother's voice cutting through the air like a whip.
"Why can't you be more like Momo?" Sakura's voice echoed. "She's always so composed, so capable. And you… you're a disappointment."
Yui froze, her body stiffening as the memory played out before her. Her gray eyes narrowed, and her jaw clenched. "What is this?" she hissed.
Another projector activated, displaying a different memory. This time, it was Yui as a child, surrounded by her classmates. They were laughing at her, their voices cruel and mocking.
"Look at her! She can only shrink things. What a lame quirk!"
Yui's breathing quickened, her hands balling into fists. "Turn it off," she growled, her voice low and dangerous.
Momo didn't respond. She stayed hidden, watching from a safe distance as Yui's composure began to crack.
The First Trap
Seizing the moment, Momo activated her sticky bombs. They shot out from hidden compartments in the walls, splattering a thick, adhesive substance across the floor. Yui tried to dodge, but the bombs detonated on impact, coating her legs in the sticky resin.
"Clever," Yui muttered, her voice dripping with disdain. She crouched, her movements slow but deliberate, and began altering her own body. Her legs shifted, the resin bubbling and dissolving as her quirk took effect.
She can adapt, Momo realized, her heart sinking. I have to keep her off balance.
She activated the next set of traps: a series of nets made from metal alloys. They shot out from concealed launchers, tangling around Yui and pinning her to the wall. Momo stepped into the light, her posture straight and confident despite the fear gnawing at her insides.
"Yui, stop this," Momo said, her voice steady. "This isn't you."
Yui's laughter filled the corridor, sharp and cold. "Oh, Momo," she said, her voice dripping with mockery. "You still don't get it, do you? This is me. The real me."
With a surge of strength, Yui tore through the nets, the metal shredding like paper in her hands. She turned to face Momo, her smile widening. "You'll have to do better than that."
The Final Stage
Momo took a step back, her mind racing. She had one more trick up her sleeve, but it was risky. She activated the final projector, which cast a memory so painful, so deeply ingrained in Yui's psyche, that Momo hesitated for a moment before pressing the button.
It was the day of the family dinner, the one where Yui had confronted her mother and uncle. Her words echoed through the hallway, raw and filled with pain: "Does anyone in this family actually love me? Or am I just… just some failure you all have to put up with?"
Yui froze, her body trembling. Her breathing grew ragged, her hands twitching as she stared at the projection.
"Shut up," she whispered, her voice cracking. "Turn it off."
Momo took a deep breath, stepping forward cautiously. "Yui, listen to me. You don't have to do this. You don't have to prove anything to anyone."
"Shut up!" Yui screamed, her voice filled with anguish. She lunged at Momo, her movements wild and frantic.
Momo threw a flashbang, the explosion of light blinding Yui and forcing her to stumble. She used the moment to create reinforced restraints, securing Yui's arms and legs.
But as Momo approached, thinking the fight was over, Yui began to laugh. It was a low, chilling sound that sent a shiver down Momo's spine.
"You think you've won?" Yui said, her gray eyes locking onto Momo's. "You don't even know what you're up against."
And with a surge of strength, she broke free.
The Final Confrontation
The air was electric, thick with tension and malice. Momo stood firm, her breaths steady despite the chaos swirling around her. Opposite her, Yui loomed like a shadow given life, her expression twisted with rage. The room seemed to shrink and warp under the weight of her quirk, the walls pressing in unnaturally as Yui advanced.
"All my life," Yui began, her voice low and venomous, "I've had to live in your shadow, Momo. Every success you had, every praise you received—it was a knife in my back. And now..." Her gray eyes burned with bloodlust as she cracked her knuckles. "Now you're going to die in mine."
Momo swallowed hard but held her ground. "Yui, this isn't you. I know you—"
"You don't know me!" Yui screamed, her voice echoing off the crumbling walls. "You've never known me. All you saw was your perfect little life, your perfect quirk, your perfect everything! You never once looked back to see who you were leaving behind!"
Momo flinched at the venom in her cousin's words but refused to let her resolve falter. She activated her quirk, summoning a sleek, collapsible staff that hummed faintly with energy as it extended. I don't have to beat her—I just need to tag her.
A Predator Unleashed
Yui moved first, her speed blinding. She shrank her form mid-step, reducing her size to half of Momo's and darting forward like a bullet. Momo barely had time to block as Yui's claws slashed at her, the impact forcing her back several paces. The sheer strength behind the attack was monstrous, far beyond anything Yui should have been capable of.
Yui twisted unnaturally, her body elongating as she grew to twice her size in an instant. Her fists came down like hammers, cracking the floor beneath Momo's feet as she dodged. "What's wrong, Momo?" Yui taunted, her voice a dark melody. "Not used to someone else being stronger?"
Momo didn't respond. Instead, she rolled to the side and created a series of caltrops, scattering them across the ground. Yui lunged again, but the sharp metal spikes dug into her feet, forcing her to retreat momentarily. Her face twisted in rage.
"You think cheap tricks will stop me?" Yui growled. She stomped her foot, shrinking the caltrops into harmless specks of dust before charging again.
Momo's Strategy
Momo's mind raced as she analyzed every move Yui made. She's burning through her stamina. Those enhancements might make her powerful, but they're not infinite. I just have to outlast her.
She activated her quirk again, creating a series of flashbang grenades. As Yui closed in, Momo tossed them, the explosions of light temporarily blinding her opponent. Yui screamed in frustration, her hands clawing at her eyes.
"Still relying on your toys," Yui spat, her voice venomous. "What happens when they run out?"
"They won't," Momo replied calmly, her voice steady despite the fear gnawing at her insides. "You've always underestimated me, Yui. That's your weakness."
Yui's laugh was sharp and hollow. "Weakness? You want to talk about weakness, Momo? You were handed everything on a silver platter—your quirk, your family's love, their approval. And you dare lecture me about weakness?"
Momo's jaw tightened, but she kept moving, setting up more traps as Yui advanced. Sticky bombs lined the walls, and reinforced nets hung from the ceiling. She was creating a battlefield tailor-made to exploit Yui's flaws.
Momo's Pain
"You think it was easy for me?" Momo shot back, her voice rising as anger and pain bled into her words. "Do you know what it's like to have everyone expect perfection from you all the time? To have every accomplishment brushed off because it's 'expected'? When I work hard, nobody celebrates because they think it comes naturally. But when I fail..." Her voice cracked, but she pressed on. "When I fail, it's like the world is ending."
Yui faltered for a split second, her gray eyes narrowing. "Spare me your sob story, Momo. You still had everything."
"I thought you'd understand!" Momo yelled, her voice trembling. "I thought, no matter what, you'd be by my side. But instead, you rejected me. You scorned me. And now..." She steadied herself, her staff crackling with energy. "Now you're trying to destroy me."
The Clash
Yui roared, her rage boiling over as she lunged at Momo with everything she had. She altered the air pressure around her, making it almost impossible for Momo to breathe. The walls seemed to close in, the ceiling groaning ominously as the support beams began to shrink.
Momo struggled to stay on her feet, her vision blurring as the oxygen thinned. But she forced herself to focus, activating her quirk to create an oxygen mask. She strapped it on quickly, drawing in deep breaths as she prepared her next move.
Yui's attacks were relentless, her claws slashing through metal and concrete alike as she closed the distance. Momo threw up a shield, reinforced with titanium, but it cracked under the force of Yui's blows. Desperation clawed at her, but she refused to give in.
She reached into her utility belt and pulled out a series of small orbs, tossing them at Yui's feet. They exploded into a sticky resin, coating Yui's legs and slowing her down. Momo didn't waste the opportunity. She activated her quirk again, creating a set of weighted nets and throwing them over Yui.
For a moment, it seemed like the plan might work. Yui struggled against the restraints, her movements frantic as she tried to break free. But then she shrank her body, slipping through the gaps in the net like water through a sieve.
"You're not getting away," Yui growled, her voice filled with venom. She grew to twice her size again, her strength amplified as she shattered the remaining restraints.
The Turning Point
Momo's mind raced. She's using too much energy. If I can push her just a little further...
She activated another light projector, this one displaying a memory of Yui as a child. It was a moment Momo knew well—the day Yui had tried to impress her parents with a demonstration of her quirk, only to be scolded for not being as "impressive" as Momo.
Yui froze, her breathing ragged as she stared at the image. Her gray eyes filled with something other than rage—something raw and vulnerable.
"Turn it off," Yui whispered, her voice trembling.
"No," Momo said firmly. "You need to see this. You need to remember who you are."
"I said turn it off!" Yui screamed, her voice breaking as she lunged at Momo.
But Momo was ready. She sidestepped the attack, activating a final trap. A metallic arm shot out from the wall, tagging Yui squarely on the back with a glowing marker. The buzzer sounded, signaling the end of the match.
The Aftermath
Yui stumbled, her body trembling as the realization sank in. She had lost. Despite all her training, all her enhancements, she had been outplayed—outsmarted—by Momo.
"You..." Yui whispered, her voice filled with anguish. "You're always one step ahead. Always better. Why can't I ever win?"
Momo hesitated, her heart aching at the pain in Yui's voice. Slowly, she stepped forward, her hand outstretched. "Yui... I never wanted to compete with you. I just wanted us to stand together."
For a moment, Yui didn't move. Her gray eyes were filled with tears, her expression conflicted. But then, slowly, she reached out and took Momo's hand.
The match was over, but for the first time in years, there was a glimmer of hope that their bond could be mended.
The Aftermath: A Classroom in Shock
The simulation doors slid open with a hiss, and the class of 1-A stood frozen, their eyes glued to the two figures stepping out. Momo and Yui walked side by side, their expressions stark contrasts. Momo was exhausted but composed, her usually immaculate hair slightly disheveled, and her steps slow yet steady. Yui, on the other hand, was pale, her gray eyes dull with defeat. There was no fire, no malice left in her—just the hollow remnants of the storm she had unleashed.
The silence in the observation room was deafening. No one spoke, no one moved. All that lingered was the memory of the match they had just witnessed on the monitors—a battle so fierce and personal it had left everyone shaken.
"Holy crap…" Kaminari finally muttered, his voice breaking the tension. "What the hell just happened?"
"That wasn't a match," Jiro whispered, her voice trembling slightly. "That was a war."
The Weight of What They Saw
Mina looked between the two cousins as they exited the arena. "Yui… she was…" She trailed off, unable to find the words to describe the sheer ferocity and malice Yui had displayed. Her usual bubbly demeanor was replaced with an uncharacteristic solemnity.
"Strong," Todoroki said simply, his tone cold but tinged with unease. "Too strong."
Even Bakugo's absence was palpable. He had been carried out on a stretcher, unconscious and battered, his face pale and his body limp. The image of Yui towering over him, her predatory smirk and unrelenting attacks, played over and over in everyone's minds.
"It's like she wasn't human," Mineta squeaked, hiding behind Kirishima. "Her movements, her powers… she's a monster."
Kirishima frowned, his usually cheerful demeanor replaced with concern. "She's not a monster," he said, though his voice lacked its usual conviction. "She's just… something happened to her."
All Might's Reaction
All Might stood at the front of the room, his larger-than-life presence somehow subdued. His usual smile was gone, replaced by a pensive frown as he watched Momo help Yui toward the exit. His sharp eyes darted to the screens where the match had played out in brutal detail.
The moment Bakugo's explosions had failed, the moment Yui had cornered him, and the chilling sight of her walking out of the flames unscathed—it all lingered in his mind like a dark cloud. He glanced at the other students, gauging their reactions. Fear, shock, and even admiration danced across their faces.
"Alright, class," All Might said, his booming voice snapping them back to attention. "That match was… intense." He hesitated for a moment, his tone softening. "But it's important to analyze what we saw and learn from it. Recovery Girl is tending to both Yui and Bakugo. They'll be fine."
"But All Might," Mina interjected, her voice uncharacteristically serious. "What even was that? Yui—she wasn't just strong. She was… terrifying."
All Might's face darkened for a split second before he forced a smile. "This is why we're here, Mina. To learn, to grow, and to become heroes who can face even the most daunting challenges."
The MVP Discussion
Once the tension settled somewhat, All Might clapped his hands together, his usual energy returning, though it felt slightly forced. "Now then, let's talk about the match. Who do you think the MVP was?"
The room fell silent again, the students exchanging uncertain glances.
"Momo," Todoroki said, breaking the quiet. His voice was firm, but his expression was unreadable.
"Why do you say that?" All Might asked, tilting his head.
"She used her quirk strategically," Todoroki replied. "Her goal wasn't just to overpower her opponent—it was to end the match effectively. She set traps, created distractions, and exploited weaknesses. Without her, the heroes wouldn't have stood a chance."
"I agree," Iida said, nodding sharply. "Momo's composure and intelligence were remarkable under such intense pressure."
Jiro crossed her arms, glancing at the screen that still displayed the final moments of the match. "I don't know… I think Yui was the MVP. She was the most powerful, the most dangerous. It's hard to call someone a 'hero' in this case, but she dominated that match until the very end."
"But it's not just about power," Kirishima argued. "Momo didn't lose her cool. She didn't let fear get the better of her. That's what makes a real hero."
All Might nodded, his smile more genuine now. "Good points all around. And you're right—it's not just about power. It's about strategy, composure, and the ability to think on your feet. That's what sets heroes apart."
He turned to Momo, who stood near the back of the room, her expression unreadable. "Yaoyorozu," All Might said, his tone warm. "You're the MVP of this match. Excellent work."
Momo blinked, surprised. "I… thank you, All Might."
Yui's Absence Lingers
As the class began to disperse, the atmosphere remained heavy. Yui's absence was palpable, her presence having left a mark on everyone. Even those who had barely interacted with her before couldn't shake the image of her standing over Bakugo, her movements predatory and her aura suffocating.
Momo lingered near the door, her thoughts swirling. She had won the match, but the cost felt immeasurable. Yui's words echoed in her mind: "All my life, I've had to live in your shadow, and now you're going to die in mine."
She clenched her fists, determination hardening her resolve. I'm going to save her. No matter what it takes.
As the students filed out, All Might watched them with a heavy heart. His sharp eyes lingered on Momo for a moment longer before turning back to the monitors. There was more to Yui than met the eye—more than anyone realized. And whatever it was, he feared it wasn't over.
Recovery Girl's Observation
The small infirmary at U.A. was filled with a tense silence as Recovery Girl inspected Yui's unconscious form. The older woman moved with her usual efficiency, her quirk activating as she placed a gentle kiss on Yui's forehead. The regenerative energy flowed through Yui's body, knitting together the superficial injuries from the battle.
But as the process continued, Recovery Girl's brow furrowed. Something wasn't right.
She leaned closer, observing the way Yui's body responded to her quirk. The injuries were healing, but it was almost redundant. Yui's wounds had already begun to close on their own before Recovery Girl's quirk even took effect. The deeper cuts were knitting themselves back together with startling speed, and even the faint bruises on her arms and face were fading before her eyes.
Recovery Girl removed her lips from Yui's forehead and stepped back, her usually calm demeanor replaced by unease. "This doesn't make sense," she muttered under her breath.
All Might, who had been standing near the doorway, stepped forward. His towering presence filled the small room, his eyes sharp and serious. "Is something wrong, Recovery Girl?"
The elderly healer turned to him, her lips pressed into a thin line. "Toshinori, have you ever heard of Yui having a regenerative quirk?"
All Might frowned, shaking his head. "No. As far as I know, her quirk is a variation of alteration—shrinking and enlarging objects. Nothing like this."
"Exactly," Recovery Girl said, her voice tinged with concern. "And yet, her body is healing itself. Not just superficially, but on a cellular level. It's far more advanced than anything I've seen outside of specialized regeneration quirks. Her body is behaving as though it's been... altered."
A Troubling Discovery
All Might's expression darkened, and his usual cheerful demeanor evaporated entirely. "Altered? You mean... experimented on?"
Recovery Girl nodded slowly. "It's a possibility. I've seen cases like this before, though not often. It's the kind of tampering I would expect from someone like All For One."
The name hung in the air like a curse, sending a chill down All Might's spine. He clenched his fists, his mind racing as he stared at Yui's still form. "Do you think she could be… one of his experiments?"
Recovery Girl sighed, placing her tools back on the tray beside her. "I can't say for sure. But her physiology is… unusual, to say the least. There's more than just regeneration at play here. Her muscle density, her bone structure—they're all far more advanced than they should be for someone her age. Whatever enhancements she's undergone, they've made her stronger, faster, and more resilient than a normal human."
All Might turned his gaze back to Yui, his sharp blue eyes narrowing. The memory of her fight replayed in his mind—the ferocity, the calculated cruelty, the way she had shrugged off Bakugo's explosions like they were nothing. It wasn't just raw power; it was the kind of power that came with training, with purpose, with intent.
Yui Awakens
A soft groan pulled their attention back to the bed. Yui stirred, her eyes fluttering open. For a moment, she looked disoriented, her gaze darting around the room until it landed on All Might and Recovery Girl. Her expression hardened instantly, a mask of indifference slipping into place.
"Where am I?" she asked, her voice low and steady despite her obvious fatigue.
"You're in the infirmary," Recovery Girl said, her tone neutral. "You took quite a beating during the trial, but you're fine now."
Yui sat up slowly, wincing slightly as she stretched. "I don't need your help. I'm fine."
Recovery Girl raised an eyebrow but didn't argue. "Well, you're free to go once you're ready. But I'll be keeping an eye on you, young lady. There's something about your condition that concerns me."
Yui's gray eyes flickered with something unreadable—defiance, perhaps, or maybe fear. She said nothing, sliding off the bed and reaching for her boots.
"Yui," All Might said, his deep voice cutting through the silence. "Before you go, I need to ask you something."
She turned to him, her expression carefully blank. "What?"
"Have you… undergone any kind of experimentation? Or enhancements? Anything that might explain what we saw during the match?"
Yui's eyes narrowed, and for a moment, her mask cracked. There was a flicker of something dark and sharp in her gaze, but it disappeared just as quickly. "I don't know what you're talking about," she said coolly. "My quirk evolved, that's all. Maybe it's finally living up to the Yaoyorozu name."
All Might studied her carefully, his instincts telling him there was more to her story. But he didn't press. Not yet. "Very well. But know this, Yui: if there's something going on, if someone is forcing you into something you don't want… you can come to me. To any of us. We're here to help."
Yui's lips curved into a faint, mocking smile. "Thanks for the concern, but I can handle myself." She turned and walked toward the door, her movements fluid and confident despite the lingering tension in the room.
All Might's Concern
Once Yui was gone, Recovery Girl sighed heavily, shaking her head. "She's hiding something."
"I know," All Might said, his voice grim. "And whatever it is, it's dangerous. Not just for her, but for everyone around her."
"We need to keep an eye on her," Recovery Girl said. "If she's a product of All For One's tampering, then she could be more of a threat than we realize."
All Might nodded, his gaze distant as he stared at the door Yui had just exited. "I'll inform Principal Nezu. For now, let's proceed with caution. Yui isn't the same girl she used to be, and if we're not careful… we might lose her for good."
The weight of their words settled heavily in the room, the shadows of doubt and fear creeping into their minds. Whatever was happening with Yui, it was only the beginning. And All Might feared that the storm she had brought with her was far from over.
A Moment of Reflection
The moon hung heavy in the night sky as Yui sat on the edge of a rooftop overlooking U.A., her legs dangling over the side. The soft glow of the city lights below danced in her gray eyes, but her mind was elsewhere—trapped in the swirling chaos of her thoughts.
Momo's words from the match rang in her ears, sharp and unrelenting.
"Do you know what it's like to have everyone expect perfection from you all the time? To have every accomplishment brushed off because it's 'expected'? When I fail, it's like the world is ending."
Yui had dismissed those words in the heat of battle, her anger blinding her to their meaning. But now, sitting alone under the cold night sky, they gnawed at her, forcing her to confront something she had buried deep inside.
Memories of Their Childhood
Yui closed her eyes, letting herself drift back to when she and Momo were children. They had been inseparable then, two little girls running through the sprawling Yaoyorozu estate, giggling as they played games in the garden. Momo, with her bright eyes and boundless energy, had always taken the lead, and Yui had followed, content to be by her side.
Momo had been the first to encourage Yui to experiment with her quirk, clapping excitedly when Yui managed to shrink a pebble for the first time. "You're amazing, Yui!" Momo had said, her smile wide and genuine. "One day, you're going to be incredible."
It was never Momo who compared them. Never Momo who pointed out Yui's flaws or made her feel small. It was everyone else—her mother, her teachers, their classmates. Why can't you be more like Momo? Look at how perfect she is. The words had etched themselves into Yui's soul, poisoning her perception of the one person who had always been in her corner.
A Harsh Realization
Yui opened her eyes, her gaze hardening. She had spent so many years resenting Momo, blaming her for things that weren't her fault. Momo had been there for her, time and time again, and Yui had pushed her away. Scorned her. Hurt her.
"I thought you'd understand! I thought, no matter what, you'd be by my side."
The memory of Momo's voice, raw with emotion, struck a chord deep within her. Yui clenched her fists, the nails digging into her palms. She hated the vulnerability it stirred in her, but she couldn't deny the truth any longer.
Momo wasn't the one who needed to pay.
A Shift in Perspective
Her mother's voice echoed in her mind: "Why can't you be more like Momo?" The disdain in those words, the constant comparison, the endless cycle of disappointment—it was never about Momo. It was about the impossible standards her mother had placed on her.
Yui's grip on the edge of the rooftop tightened. It's not Momo who deserves my anger. It's them. My mother. Everyone who looked down on me, dismissed me, made me feel like I wasn't enough.
She exhaled slowly, her breath visible in the cool night air. Momo didn't need to suffer. She didn't need to pay for Yui's pain. All Yui needed was to beat her—to prove, once and for all, that she could escape Momo's shadow. Then, maybe, she could let go of the bitterness that had consumed her for so long.
A Lingering Bond
Yui's gaze softened as she thought of Momo. They had been raised like sisters, neither of them having siblings, and all they'd had was each other. Even now, after everything, that bond lingered, fragile but unbroken.
She rested her chin on her knees, her thoughts swirling. Momo's life had been far from perfect, despite how it seemed on the surface. The pressure, the expectations—it wasn't so different from what Yui had endured. And yet, Momo had never let it harden her. She had remained kind, hopeful, supportive.
Yui let out a bitter laugh, the sound hollow in the still night. "You're stronger than I ever gave you credit for, Momo," she murmured. "Stronger than me."
But Yui wasn't ready to admit defeat. Not yet. She had to prove herself first—to Momo, to her family, to herself. She had to win, not out of hatred, but to escape the weight of the past. To prove that she could be more than the failure everyone saw her as.
Resolution
Yui stood, the night breeze tugging at her hair as she looked out over the city. Her gray eyes burned with determination, the anger that had once consumed her now tempered by something sharper—clarity.
"I'll beat you, Momo," she said softly, her voice steady. "But not to hurt you. Not anymore. Once I do, you'll be free to live your life. And maybe… maybe I'll finally be free too."
With that, Yui turned and walked away from the edge, her footsteps silent as she disappeared into the shadows.