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The concrete of the Dagobah Municipal Beach park was unforgiving, but for twelve-year-old Izuku Midoriya, it was the only training ground that didn't come with the judgmental stares of his classmates. He was a mess of tangled green curls and sweat-soaked rags, his scrawny legs trembling as he tried to mimic a basic side-kick he’d seen in a pro-hero highlight reel.

"Hah... hah... one more," he wheezed, his voice cracking. He swung his leg. It was slow, telegraphed, and lacked any real snap. He stumbled, his oversized red shoes scuffing the pavement as he nearly toppled over.

"Yikes. That was pathetic. You look like a newborn fawn trying to walk on ice, kid."

Izuku jumped nearly a foot into the air, his heart hammering against his ribs like a trapped bird. He spun around, his eyes wide and watering as they landed on a figure perched atop a nearby concrete wall.

It was Mirko. The Rabbit Hero.

She was a vision of raw, kinetic energy. Her long white ears flicked with amusement, and her red eyes scanned him with a piercing intensity. Even sitting down, her muscular build was intimidating—her thighs, thick and corded with power, looked like they could crush boulders.

"M-M-M-Mirko!" Izuku shrieked, his face turning a shade of red that rivaled her eyes. "The Number Five—wait, no, you recently moved up! The Rabbit Hero! Your Quirk is Rabbit, which gives you incredible leg strength and hearing, and you’re known for your solo work and—"

"Deep breaths, curly. You’re gonna pass out before you finish my resume," Rumi laughed, a loud, boisterous sound. She hopped down from the wall with effortless grace, landing silently. She walked a circle around him, sniffing the air. "You’re scrawny. Really scrawny. And you’re Quirkless, aren't you?"

Izuku flinched, his shoulders hiking up to his ears. "I... how did you...?"

"I’ve got the ears of a rabbit, kid. I can hear your heart skipping beats and the way your joints click. Plus, if you had an emitter or transformation quirk, you’d have tried to use it to keep from falling on your face just now," she shrugged, placing a hand on her hip, the yellow crescent moon on her chest gleaming in the afternoon sun. "But you’ve got guts. Most kids your age are playing video games, not trying to break their shins on concrete. You want to actually learn how to use those stilts of yours?"

Izuku blinked, his mouth hanging open. "Y-You want to help me? But... I'm just... I'm nobody."

Rumi grinned, showing off her slightly pointed teeth. "I don't train 'nobodies.' I train people with a spark. You’ve got a look in your eyes like you’re ready to bite the world’s head off. Meet me at this address tomorrow morning. Don't be late, or I’ll kick you into next week."

***

The weeks that followed were a blur of agony and adrenaline. Rumi didn't believe in "light" training. On her days off, she brought Izuku to her private gym—a high-end facility filled with reinforced equipment that smelled of ozone and hard work.

"Again! Stop thinking with your head and start feeling with your glutes!" Rumi barked, leaning against a punching bag. She was dressed in her hero leotard, the purple trim accentuating the sharp lines of her physique.

Izuku was currently flat on his back, gasping for air. "I... I'm trying! But the trajectory of the kick requires a specific pivot of the standing foot to maintain balance while maximizing centrifugal force—"

"Shut up with the nerd talk!" Rumi stepped over him, looking down with a smirk. "You’re over-analyzing. Fighting isn't a math equation, it’s an instinct. Watch."

She exploded into motion. It was a blur of white and purple. Her leg whipped out in a *Luna Fall*, the air whistling as her heel stopped a fraction of an inch from a heavy bag. The force alone caused the bag to ripple.

Izuku stared, mesmerized. His eyes wandered down to her legs—the sheer definition of her quadriceps and the way her calf muscles bunched like coiled springs. He felt a strange heat creep into his cheeks.

"Hey, kid. My eyes are up here," Rumi teased, her ears twitching. She leaned over, putting her face close to his. "Like what you see? I know, I know. I’m thick in all the right places. Most guys would pay for a view like this, but you’re getting it for free."

"I-I wasn't! I mean—the muscular anatomy is just—it's very efficient for power generation!" Izuku stammered, covering his face with his hands.

Rumi let out a peal of laughter, slapping her thigh. "You’re a riot! 'Efficient for power generation.' Just admit it, I’ve got a great ass. It’s okay to have good taste, even if you’re still a shrimp."

She grabbed his hand and hauled him to his feet, nearly dislocating his shoulder with her strength. "Now, get in the stretching rack. If you want legs like mine, you need flexibility. And don't go staring at my hamstrings while I’m spotting you, or I’ll make you do five hundred burpees."

Despite the teasing and the grueling workouts, Izuku found himself smiling more than he ever had. Rumi was loud, abrasive, and incredibly blunt, but she treated him like he existed. She didn't look at him with pity; she looked at him like a project that was worth her time.

However, a month into their training, the weight of the outside world began to bleed through.

During a sparring session where Izuku was supposed to be practicing his footwork, he tripped over his own feet for the fifth time in ten minutes. He didn't get up. He just sat on the mat, staring at his trembling hands.

Rumi stopped her shadow-boxing, her expression softening as her ears drooped slightly. She walked over and sat down cross-legged in front of him. "Alright, spill it. You’ve been moping all day. You’re moving like you’ve got lead in your shoes. What’s the deal?"

"It's nothing," Izuku whispered, his voice thick. "Just... school. And stuff."

"Don't give me that 'nothing' crap," Rumi snapped, though there was no heat in it. "I can hear your breathing. It’s shaky. Someone mess with you? I’ll go kick their teeth in right now. Give me a name."

Izuku looked up, his green eyes brimming with tears. "It’s not just one person. It’s... everything. Everyone says I’m wasting my time. That a Quirkless kid can't be a hero. My teachers, my classmates... even my mom looks at me like I’m a broken toy. I come here and you’re so amazing, and I’m just... I’m still just a scrawny kid who can't even do a proper kick."

A sob broke through his chest. "I feel like I’m running as fast as I can just to stay in the same place. The pressure... it feels like it’s crushing me."

The gym went silent, save for the hum of the air conditioning. Izuku waited for the ridicule, for her to tell him to toughen up or get out.

Instead, he felt a pair of strong, gloved arms wrap around him.

Rumi pulled him into a fierce hug, tucking his head under her chin. She smelled like peppermint and sweat. It wasn't a delicate hug; it was firm and grounding, like she was physically holding him together.

"Listen to me, you little brat," she murmured, her voice uncharacteristically low. "The world is full of people who want to tell you 'no' because they’re too scared to try 'yes.' They look at you and they see someone weak because it makes them feel better about their own pathetic lives."

She pulled back just enough to look him in the eye, her hands resting on his shoulders. "You think I got to be the Number Five hero by listening to people? I was told my style was too reckless, that I was too loud, that I should join a team because a solo woman couldn't make it. I told them to go to hell and worked ten times harder."

She wiped a tear from his cheek with her thumb. "You’re not 'just' a scrawny kid. You’re the only person I’ve ever met who keeps getting back up no matter how many times I knock him down. That’s more 'heroic' than half the pros on the charts right now. So, you cry if you need to. Get it out. But don't you dare believe them."

Izuku let out a wail, burying his face in her shoulder and clutching the back of her white leotard. He cried for the years of loneliness, for the "Deku" nicknames, and for the crushing weight of a dream that felt impossible. Rumi just held him, rocking him slightly, her long ears shielding him from the rest of the world.

After a long while, the sobs subsided into hiccups. Izuku pulled back, looking incredibly embarrassed, his face a blotchy mess of red and salt.

"I... I'm sorry. I got your costume all wet," he mumbled, looking at the floor.

Rumi snorted, standing up and stretching her arms over her head, her muscles rippling. "Eh, it’s mostly sweat anyway. Besides, it’s high-quality fabric. It can handle a little bit of Midoriya-brand saltwater."

She reached down and ruffled his hair so hard it obscured his vision. "You feel better? Or do I need to let you cry on my 'fat ass' like you were staring at earlier?"

"Mirko!" Izuku squeaked, his entire body turning the color of a beet.

"Hah! There he is! The kid’s back!" She laughed, picking up a water bottle and tossing it to him. "Take five minutes. Then we’re working on your *Luna Arc*. If you miss the mark this time, I’m making you eat a raw carrot. And I hate carrots, so you’ll have to eat it while I watch and judge you."

"That's... that's not even a punishment, that's just weird," Izuku said, a small, genuine smile breaking through his lingering sadness.

"It’s psychological warfare, kid! Get used to it!"

As the session wound down and the sun began to set, casting long shadows across the gym floor, Izuku packed his yellow backpack. He felt lighter than he had in years. The world hadn't changed—he was still Quirkless, and school would still be hard—but he felt like he finally had a foundation to stand on.

Rumi was leaning against the doorway, watching him. She looked less like a fearsome pro-hero and more like a proud older sister, though she’d never admit it.

"Hey, Mirko?" Izuku called out as he reached the door.

"Yeah, shrimp?"

Izuku hesitated, his fingers twitching on his backpack straps. Then, before he could lose his nerve, he stepped forward and wrapped his arms around her waist in a quick, tight squeeze.

"Thank you," he whispered. "For everything."

He let go immediately, his face heating up again, and began to shuffle away. "I’ll see you on Thursday! I’ll practice my pivots! I promise!"

Rumi stood frozen for a second, her ears standing straight up in genuine surprise. A faint pink hue touched her tan cheeks. She watched him scramble down the hallway, his oversized shoes squeaking on the linoleum.

"Cheeky brat," she muttered to the empty gym, a soft, lopsided grin crossing her face. She looked down at her waist where he’d hugged her. "He’s gonna be a problem when he grows up. A real problem."

She turned and delivered a thunderous kick to the nearest heavy bag, the sound echoing like a gunshot.

"Better make sure he’s the world’s problem and not mine," she laughed, her eyes flashing with a wild, joyful fire. "Keep running, kid. I’m right behind you."