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Demon Slayer: I'm Tanjiro's Sister But I'm Not Nezuko!

MiRnOuCh
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Synopsis
Reincarnated into the world of Demon Slayer, she expected danger. Though, she didn’t expect to wake up as Tanjiro Kamado’s older sister— nor to watch her family’s blood stain the snow. Armed with knowledge of how this story ends, Chika Kamado swears to defy fate itself. If Tanjiro must walk the path of a demon slayer, then she will walk it beside him — blade in hand, heart on fire. Trained by Urokodaki, mastering both Water Breathing and Hinokami Kagura, Chika becomes a new variable in a world bound by tragedy. Her choices ripple across history— saving Nezuko from despair, confusing Muzan’s plans, and even reviving powers thought lost to time. But with every victory comes consequence. For somewhere in the dark, Muzan Kibutsuji trembles— haunted by a familiar flame he once failed to extinguish. “You bear that sword’s mark… The Sun’s mark. The one I fear most.” As the threads of destiny begin to fray, can one older sister’s will rewrite a story written in blood?
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Chapter 1 - Chapter 1 – The Night of Slaughter

"Nezuko! What's wrong—wha… what happened?!"

A boy in a green checkered haori knelt halfway in the snow outside a broken-down wooden cabin.Beside him lay a girl soaked head to toe in blood.

When he turned toward the house, his eyes quaked as though an earthquake had struck within them—because everyone inside, his entire family, lay drenched in crimson, their bodies torn and clawed beyond recognition.

Amid the collapse of his mind, the boy realized that the girl beside him—his sister, Nezuko—still carried a faint trace of warmth.

He hurriedly wiped his tears, slung her onto his back, and stumbled down the mountain, gasping for breath as he searched for a doctor who might save his last remaining family.

Moments after he left, another girl—also drenched in blood and wounds—suddenly opened her eyes inside the cabin, choking for air.

It hurts! It hurts so much! What's happening? Is this all blood? I can't breathe… I'm suffocating…

The girl arched her back, gulping air, trying desperately to calm herself. As her thoughts began to clear, fragments of memories and an overwhelming surge of emotion crashed into her mind.

Kamado… Chika?!

The world of Demon Slayer?!

Wait, hold on—there was no character named that! Tanjiro's the eldest, Nezuko's the eldest daughter—where did this "character slot" come from?!

Chika Kamado tilted her blood-stained face toward the ceiling—familiar yet foreign.

Of course she knew Demon Slayer. Who didn't? Even people outside the anime community had heard of it. It was one of the biggest hits in recent years.

Her blurred eyes swept across the room.Her mother, Kie Kamado, and her younger brothers—Takeo, Shigeru, and Rokuta—lay motionless.The thick scent of blood churned her stomach.

Gritting her teeth, Chika forced her broken body to move. The stiffness made every motion clumsy and puppet-like. The pain faded, strangely enough, though blood still seeped from her wounds.

So the pain's gone… but not the bleeding?

Confusion flickered through her mind, but this was no time for questions. She dragged herself through the cabin, step by trembling step, until she reached the kitchen. She searched for a mirror to see her reflection but found only shattered shards glinting on the floor.

Her inherited memories were hazy, filled more with emotion than thought. Pressing a hand to her throbbing head, she tried to leave the kitchen—but as soon as she stepped outside, her uncooperative body betrayed her, and she collapsed into the snow.

Damn it! You drag me into another world, fine—but couldn't you at least give me a functional body? I'm not asking for Mitsuri-level muscles, but maybe some kind of cheat ability? Something?

She lay sprawled in the snow, lips barely able to move, but her mind raged like a storm.She cursed whatever cosmic force had sent her here—no vulgarity, just precision strikes of pure frustration aimed straight at Heaven's pride.

Heaven, naturally, gave no reply.

Time passed. Tanjiro and Giyu Tomioka had already finished the events of the first scene. Tanjiro now returned to his home with Nezuko—who, though turned into a demon, had regained her consciousness.

He planned to gather and bury his family, but when he saw the figure lying in the snow outside—the sister who should've been dead inside—his eyes widened in shock.

"E–Elder sister!!!"

He ran toward her, Nezuko following right behind with her round, anxious eyes, stomping her feet in panic.

Tanjiro knelt and placed a trembling finger under Chika's nose.A faint breath. Still alive.

"She's alive! If I can get her to a doctor in the village—there might still be time!"His hands shook as he spoke, and Nezuko's tears rolled down her cheeks like beads.

Now's not the time to cry!

Tanjiro wiped his face with the back of his hand, pushed past exhaustion, and lifted Chika onto his back again. With Nezuko beside him, he dashed down the mountain toward the nearest settlement.

At the foot of the mountain, they found a village doctor. The moment the man saw the girl on Tanjiro's back, he froze.

These wounds… she's not going to survive this.

"Doctor! Please, please save my sister!" Tanjiro pleaded, voice cracking.Nezuko nodded frantically beside him, her small head bobbing like a motorized toy.

But the doctor fell silent.Even at a glance, he could tell—these injuries were far beyond what a rural physician could treat.

"I'm sorry," he finally said, his voice low. "There's nothing I can do."

Tanjiro's composure broke.The worst despair isn't the absence of hope—it's being given hope, only to have it ripped away.

"How… how could this happen…" he whispered, trembling. Nezuko couldn't hold back her tears either, her eyes swelling like little beans of sorrow.

And then—on Tanjiro's back—Chika's eyes snapped open.

Her body was wrecked, but her gaze was alive.

"Don't cry," she muttered weakly. "I'm not dead yet."

Everyone froze.The doctor, in particular, looked as if he'd seen a ghost.

A thousand words of disbelief condensed into a single curse under his breath, while Chika, still slung over Tanjiro's shoulder, stared ahead with dead-fish eyes.

Honestly, she wasn't sure why she was still alive either.But if she was—then she probably wasn't dying anytime soon.Maybe a little 'transmigrator bonus,' huh?

Her priority now was simple: get used to this body.

"Tanjiro, you can put me down now," she said softly.

But both Tanjiro and Nezuko immediately froze in alarm.Nezuko shook her head wildly, arms flailing in protest.Tanjiro's voice came firm and absolute: "No! I won't!"

Chika blinked at their terrified faces. Then it clicked.

"Put me down"—they thought it meant "Leave me to die."

Good grief. Both siblings were linguistic prodigies—of tragedy.