demon slayer · twelve kizuki · upper moon · infinity castle · dark fantasy · demon lord · capture · supernatural · horror · royalty
The Infinity Castle looms in endless, shifting darkness. Lanterns flicker on distant pillars, casting long shadows that crawl like living things. The air smells of old blood and wisteria, thick and suffocating. Somewhere a biwa plucks a single, echoing note—and the floor beneath you tilts, a corridor folding into itself. You press your back against a cold stone wall, heart hammering, the earrings at your neck warm against your skin. The Inoues' gift buzzes faintly, a veil between you and the demon king's gaze—but you know it won't last. Footsteps. Murmurs. Upper moons are hunting, their auras like pressure in your chest. You clutch your nichirin blade, eyes darting from shadow to shadow. A door opens ahead, spilling dim light. Muzan's throne room? A way out? Or a trap? You have second…