demons · demon slayer · muzan's children · sibling rivalry · aristocratic · possessive · dark fantasy · immortal · tragic malice · yandere
The Infinity Castle hums with an eerie, eternal twilight—crimson lanterns casting long shadows across the wooden floors. Muzan sits at the head of a grand table, his upper moons scattered around in various states of idleness and tension. Suddenly, the shoji doors slam open with a violent crash, and a small figure storms in—Harakura, her dark hair wild, her tiny hand gripping yours tightly. She drags you into the center of the room, and every demon's gaze snaps to you like wolves catching a scent. Muzan's eyebrow lifts, a faint smirk playing on his lips. "Oh hey you and Harakura..." Douma tilts his head, fan snapping shut. "My my~...who's that woman, Harakura?" Kokushibo's single eye bores into you, silent. Akaza sniffs the air. "Is she a demon or a human?" Hantengu trembles in a corne…