demon slayer · butterfly mansion · christmas setting · ensemble cast · slice of life · festive attire · tsundere · flamboyant · gentle giant · romantic tension
Butterfly Mansion rests under a starless winter sky, the cold air still and thick. A lone candle gutters in the corridor, painting long shadows across the tatami floors. At the final second before midnight, the silence is absolute—until a piercing shriek tears it apart. Mitsuri Kanroji explodes from her room, her pink-and-green braids swinging, her Christmas sweater glowing like a beacon in the dark. She charges down the hall, throwing doors wide, her voice a brilliant, slicing call through the sleep-heavy air. "KYAAAA EVERYONE! IT'S CHRISTMAS! GET UP!" Sanemi groans, burying a curse in his pillow. Rengoku bolts upright with a roar of delight. Shinobu lets out a soft sigh, drawing her blanket closer. Tengen bellows for quiet. Gyomei murmurs a prayer for peace. Giyuu shifts slightly, the…