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falling for the enemy

Summary:

After the tragic night when Tanjiro’s family was mercilessly slaughtered by demons, leaving only his sister Nezuko alive but transformed into a demon, he set out on a path of relentless determination to become a Demon Slayer. His heart burned with grief and an unshakable resolve—to protect others from suffering the same fate his family had endured.
But fate is cruelly unpredictable. Time and again, Tanjiro found himself face-to-face with Muzan Kibutsuji, the elusive and terrifying Demon King responsible for his family’s destruction. Each encounter left him shaken but strangely conflicted. There was something about Muzan—an enigmatic aura that stirred unfamiliar emotions within Tanjiro, emotions that defied his sense of duty and everything he believed a Demon Slayer should feel.

Chapter 1: The Beginning

Chapter Text

Tanjiro’s POV
I woke before dawn, the first pale fingers of light barely brushing the horizon, tinting the sky with soft hues of pink and lavender. The mountain air was crisp and biting, each breath filling my lungs with a cold freshness that stung but also invigorated me. The world was still mostly cloaked in silence, save for the faint rustling of pine needles and the occasional distant call of a bird beginning its morning song.
Winter had settled deeply this year. The snow lay thick on the ground, blanketing the village in a quiet, white stillness. I pulled my coat tighter around me and hoisted my bundles of charcoal and chopped wood onto my back. It was the same routine every day, but somehow, it never lost its significance. Each trip down to the village was a chance—not just to support our livelihood, but to keep alive the memory of my family, to honor their sacrifices by working hard in their stead.
As I stepped carefully along the narrow, winding path, my eyes swept over the familiar valley below. Smoke curled lazily from chimneys, mingling with the cold morning air. The village was waking—soft murmurs, the clatter of pots, and the occasional laughter drifting upward like a fragile thread of warmth. This place, humble and unassuming, was home. I had grown to cherish its quiet rhythm, its simple, steady life.
Before long, I passed the first cluster of houses. My feet slowed as I saw Mrs. Fujimoto waiting by her doorstep, her frail frame wrapped in layers of woven cloth. Her smile was like a gentle sunbeam cutting through the cold.
“Ah, Tanjiro,” she greeted, her voice tinged with kindness and concern. “You’ve wrapped up warm, I hope. It’s bitter today.”
I bowed respectfully, feeling the weight of her care. “Yes, ma’am. I brought extra clothes and a thick scarf. Thank you, Mrs. Fujimoto. How have you been keeping?”
She chuckled softly, eyes twinkling. “Old bones don’t mind the cold much, but it’s good you look after yourself. The village depends on you.”
Her words warmed me more than the sun ever could. It was in moments like these—the shared smiles, the simple conversations—that I found strength to keep moving forward.
The day unfolded as usual: selling charcoal at the market square, assisting neighbors with repairs, carrying firewood to those too weak or old to do it themselves. I even helped a few elderly women gather root vegetables from the frost-covered fields. The work was hard, exhausting, but it grounded me. Each chore, each interaction, felt like a thread weaving me closer to the people I vowed to protect.
As the sun dipped low, bathing the world in molten gold, I began my climb back up the mountain. The path was steep and uneven, and my muscles ached from the day’s labor, but the silence of the woods was a balm to my restless mind.
Passing by Sobato’s humble cottage, I noticed the dim glow of a candle flickering inside his window. The old man’s breathing was slow and steady; I imagined the stories he must be dreaming of—the distant memories of his youth, filled with laughter and adventure.
That’s when I caught it. A strange scent riding the cold wind. It was subtle at first—like copper mixed with something wild and unnatural—but it grew stronger with every step.
Blood. The unmistakable, iron tang of fresh blood.
My heart seized. A cold shiver crawled down my spine as dread settled deep in my chest. Without thinking, I broke into a run, the bundles of wood bouncing against my back. The forest seemed to close in around me, shadows stretching long and dark in the fading light.
When I reached my home, the scent was suffocating. My hands trembled as I pushed open the door, and the nightmare unfolded before me.
My mother, my father, my six siblings—lay lifeless, blood staining the wooden floor. The air was thick with horror and silence, a scene too cruel to comprehend. Each face frozen in death, the brutal evidence of a merciless attack.
I dropped to my knees, tears streaming freely down my cheeks. How? Why? The questions tormented me as anguish engulfed my heart.
I didn’t notice the figure until a voice broke the silence.
“Child, what happened here?”
I looked up, startled. A tall man stood in the doorway, his expression grave yet not unkind. His presence was commanding, yet calm.
“My name is Tomioka Giyuu,” he said softly, “I am a Water Hashira of the Demon Slayer Corps. From what I see, demons are responsible for this tragedy.”
His words pierced through my numbness. Hope and despair battled inside me.
“I can train you,” he continued, “Prepare you to fight, to protect others from suffering as you have. The Final Selection takes place next year. If you accept, you’ll have a chance to join our ranks.”
I met his steady gaze, my thoughts a storm. Rage, sorrow, confusion—but beneath it all, a fierce ember of determination.
“My family’s deaths will not be in vain,” I whispered, voice trembling but resolute. “I accept your offer. But I want to train alone. To rely on my own strength.”
For a moment, a flicker of approval crossed his face.
“Very well,” Giyuu said quietly. “But be warned—the path is unforgiving, and your resolve will be tested like never before.”
He vanished as silently as he came, leaving me with my grief and an unyielding resolve.
Gathering the few belongings left—my father’s worn swords, his handwritten journal filled with notes on breathing techniques and swordsmanship—I set out into the cold night. The journal was a beacon of guidance, a legacy from the man I admired most.
As I walked under a canopy of stars, memories of my family mingled with the promise I’d made. This journey wasn’t just about vengeance—it was a mission to protect others, to stop the cycle of loss.
A faint sweetness drifted through the air, breaking my reverie. I spun around, eyes scanning the darkness, but saw nothing. The wind whispered through the trees—a trick of nature, or perhaps a sign that my path would be anything but ordinary.
Three days later, I arrived at the foot of Mount Kita. This remote, rugged terrain would become my training ground. The days blurred into weeks as I pushed my body and mind to their limits—mastering Total Concentration Breathing, strengthening my endurance, learning the ancient Sun Breathing style passed down through my bloodline. The pain was relentless, but I welcomed it as part of my transformation.
Time sped by. Soon, I stood at the base of Mount Fuji, heart pounding with a mix of fear and determination. The Final Selection awaited.
Clad in a simple black kimono, barefoot as was my choice, I attracted curious glances from the other candidates. But appearances didn’t matter. I was ready.
The trials began immediately—nonstop battles against demons desperate to end our lives. I fought with everything I had, fueled by memory and purpose. Seven demons fell on the first day alone.
With each clash, my confidence grew. By the end of the grueling week, I had slain fourteen demons. No mercy, no hesitation. This was my vow—to protect, to avenge, and to prevent further suffering.
When the trials concluded, a black crow appeared to me—a symbol that I had become a Demon Slayer. They handed me an ore for forging my sword. The blade I chose was unassuming at first glance, but as I held it, it seemed to pulse with a hidden power.
Weeks later, my sword arrived, its blade shifting with images of radiant sunlight and flickering flames. It was more than a weapon—it was a symbol of hope, of strength. I whispered to myself, “Beautiful.”
Soon after, the crow returned, its sharp caws cutting through the morning air.
“CAW CAW! Head southeast to the village of Toei. Young girls have been disappearing at night. Hurry, southeast, CAW CAW!”
I sighed, gathering my gear. The mission awaited. It took two days to reach Toei, the air growing heavy with the unmistakable scent of demon presence.
That night, I tracked the creature through shadows and silence. The battle was fierce and long, lasting nearly two hours. But eventually, my blade found its mark. The demon fell.
Exhausted but determined, I checked into a small inn, the weight of the day settling on my shoulders. Changing out of my kimono, I laid down, sword close by, and closed my eyes.
Unbeknownst to me, in the darkness outside, eyes watched silently through the window—an unseen presence waiting for the next move.