Pain.
Sharp, electric pain lanced through her chest like someone had driven a kunai straight into her heart and twisted. Her lungs seized, refusing to draw air. Vision blurred—dark spots dancing at the edges. A heavy weight pinned her down, hot breath against her neck, rough hands gripping her thighs hard enough to bruise.
"Relax, little one," a deep, familiar voice murmured above her. "It's part of becoming a real kunoichi. Breathe through it."
She tried to scream, but only a choked gasp escaped. The rhythm above her was relentless—thrusting, stretching, filling. Something warm and wet trickled between her legs. Blood? Sweat? She couldn't tell. Her body—this body—wasn't listening. It spasmed once, violently, then everything went black.
And then... nothing.
Until now.
Consciousness slammed back like a bucket of ice water. Her eyes flew open. She was lying on her back, sheets tangled around naked legs, the air thick with the musky scent of sex and something metallic—blood. Her blood.
Her heart hammered once—hard—then steadied. Too steady. Too strong.
What the fuck?
She bolted upright, sheets falling away. Small breasts, pale skin, dark hair sticking to sweat-damp shoulders. Hands flew to her chest—no gaping wound, no pain anymore. Just smooth, unmarked skin. But the ache lingered in her core, a dull throb between her thighs, sticky wetness coating her inner legs.
Panic clawed up her throat.
This isn't my body.
She scrambled off the bed on shaky legs, nearly tripping over discarded clothes—a simple Academy uniform skirt, white blouse half-unbuttoned, panties torn at the seam. Moonlight spilled through a narrow window, illuminating a small, sparse room: single bed, wooden desk piled with scrolls, a mirror hanging crookedly on the wall.
She stumbled to it.
The face staring back was... pretty. Delicate features, wide dark eyes framed by long lashes, full lips still swollen and red. Black hair fell in messy waves past her shoulders. She looked about eighteen—nineteen maybe. Young. Too young for the memories crashing through her skull like a tidal wave.
Memories that weren't hers.
Hayami Tanaka. That was the name. Third-year Academy student. Average grades in taijutsu, good at theory, mediocre chakra control. Tonight was her birthday—eighteen. Adulthood. And Academy tradition for "promising" kunoichi: a private "lesson" with one of the instructors to... initiate them properly.
The man—Mizuki-sensei—had been gentle at first. Kissing, touching, whispering how important it was for a kunoichi to master her body as a weapon. Then clothes came off. Fingers. Tongue. Pain when he pushed inside. She—he—had whimpered, tried to push him away when it hurt too much. He held her wrists above her head.
"You're doing fine," he'd grunted, hips snapping harder. "Just take it. Good girls take it."
Her—Hayami's—heart had stuttered. Skipped. Then seized.
And stopped.
The last thing Hayami felt was terror. The last thing she saw was Mizuki's face twisting in annoyance as her body went limp beneath him.
Then she woke up inside the corpse.
"Oh god," she whispered, voice cracking. Her voice. Higher, softer than her old one. "Oh god, oh god, this is real."
She pressed palms to the mirror, staring at the reflection. The girl in the glass looked horrified. Looked like her—sort of. Same wide-eyed panic she remembered from binging Naruto at 3 a.m.
Naruto.
The realization hit like a Rasengan.
She was in the Naruto world.
But not her Naruto world.
This one had delayed graduation. Everyone stayed in the Academy until nineteen. Kunoichi got... special training. Seduction. Manipulation. Sex as a mission parameter. Honey traps. Brothels as cover. Nobles demanding "service" from Leaf's finest daughters.
And tonight—her first night—was supposed to be the start of that path.
Except the original Hayami died mid-fuck.
And now she was here. A twenty-something office worker/fangirl trapped in an eighteen-year-old girl's freshly deflowered, heart-failure-surviving body.
She slid down the wall, knees to chest, ignoring the sticky ache between her legs.
Think. Think like a fanfic protagonist.
She knew the timeline. Naruto was twelve-thirteen right now—Academy days. Class with Sasuke, Sakura, Ino, Shikamaru, Choji, Hinata... all the rookies. Mizuki was still around, the traitor who'd try to steal the Scroll later.
But in this world? Mizuki apparently fucked his students to death.
She laughed—hysterical, broken. "Great. Isekai'd into smut Naruto. Of course."
Memories flickered again. Not just tonight. Months of whispered lessons in empty classrooms. "A kunoichi's body is her sharpest kunai." Demonstrations. Hands on her—on Hayami—showing pressure points that doubled as erogenous zones. Group "practical exams" coming soon. Partner rotations. Learning to take multiple at once without breaking. How to fake pleasure while slipping poison into a drink during climax.
And the worst part?
Some of the girls in her class were excited about it. Ino talked about seducing a noble for intel like it was a shopping trip. Sakura blushed but didn't protest when instructors said final-year girls would start "field rotations" at brothels in the entertainment district.
This wasn't the shonen she loved.
This was dark. Twisted. Erotic. Dangerous.
And she was stuck in it.
She touched her sore entrance gingerly. Still tender. Still leaking a mix of cum and blood. The original Hayami had been a virgin until an hour ago.
Not anymore.
A knock at the door made her freeze.
"Hayami?" Mizuki's voice—smooth, concerned now. "You passed out. Let me check on you."
Her stomach lurched.
He thought she was just unconscious. Not dead. Not replaced.
She had seconds.
What do I do?
Run? Scream? Pretend?
No. She knew Mizuki. Canon Mizuki was a manipulative bastard. This one was worse.
She couldn't let him see weakness.
She forced herself to stand, wincing at the pain shooting up her thighs. Grabbed the torn panties—useless—then yanked on the skirt and blouse. Buttons misaligned. Didn't matter.
Deep breath.
She cracked the door, keeping her body angled so he couldn't see the bed.
Mizuki stood there, shirt half-open, hair disheveled. Concern in his eyes—fake, she knew now.
"You okay, sweetheart?" He reached to touch her cheek.
She flinched back on instinct.
His brow furrowed. "Hey. Talk to me. Was it too much?"
Too much? You killed her, you fuck.
But she couldn't say that.
Instead, she forced a shaky smile. The kind Hayami's memories said she used when nervous.
"I... I just got dizzy. I'm fine now."
He studied her. Then smirked, stepping closer. "Good. Because we're not done with your birthday present."
Her pulse spiked.
He reached for the door to push it wider.
She had one chance to play this right—before he realized something was wrong with "Hayami."
Before the real lessons began.
Before the Academy, the missions, the nobles, the brothels...
Before she had to decide whether to fight this world...
Or use her meta-knowledge to become its most dangerous kunoichi.
She met his eyes. Let a little heat bleed into her voice—Hayami's memories guiding her.
"Then... come back inside, sensei."
His smile widened.
The door clicked shut behind him.
And somewhere deep inside, the fangirl screamed.
But the new Hayami?
She was already calculating.
First step: survive the night.
Second step: never let them see you break.
Third step...
She didn't know yet.
But she would learn.
Fast.
End of Chapter 1