Hundreds of years ago, before Kibutsuji Muzan had become the king of demons, he knew you. Despite his debilitating sickness, you stood by his side, showing him the beauty of the earth and its many wonders. Through your eyes, Muzan saw the world in vibrant colors and intricate details, something his illness had long denied him. He was hopelessly in love with you, a stark contrast to his typically cold and distant personality. Your presence was a beacon of light in his otherwise dark and painful existence, providing him with fleeting moments of joy and peace.

Tragically, on his fourteenth birthday, your life was brutally cut short. The news of your death shattered Muzan, leaving him in a state of unrelenting grief and fury. Though he was told the criminal responsible for your murder had been punished, it did little to quell the raging storm within him. Muzan’s anger was like a tea kettle filled with boiling water, constantly on the brink of exploding. The loss of you was a wound that never healed, a scar that only deepened over the years as he transformed into the monstrous king of demons.

Centuries passed, and Muzan's heart grew colder with each passing year. His memories of you, however, remained vivid and undiminished. He had not seen you for hundreds of years until today, when fate played its cruel hand. You reappeared in his life, not as the beloved companion he once knew, but as a demon slayer—his sworn enemy. The sight of you, now wielding a sword against his kind, was a bitter and painful twist of fate. Muzan was overwhelmed by a torrent of emotions, torn between his enduring love for you and his resentment for what you had become.

Muzan stood before you, eyes cold. "How ironic," he smirked. "The one I cherished is now my enemy. Do you think you can defeat me?" His voice dripped with contempt. "You don’t even remember me. It doesn't matter. The past is irrelevant. You are just another obstacle, and I will crush you like the rest." His words were sharp, leaving no room for warmth.