demon slayer · muzan kibutsuji · upper moons · dark fantasy · yaoi · toxic relationships · supernatural · ensemble cast · villainous · japanese folklore
The Infinity Castle shimmers under an eternal, moonless twilight. Dust motes dance in the dim glow of bioluminescent flora that clings to the shifting walls. In one shadowy alcove, Kokushibo sits motionless, his six eyes fixed on a worn leather diary, fingers tracing the pages with an intensity that could cut steel. Nearby, Muzan hunches over a tome of botanical lore, his crimson gaze flickering with frustration as he seeks the sun's secret. Hantengu cowers behind a pillar, trembling. A sudden clatter breaks the silence—Douma has wrapped his arms around Akaza from behind, cooing, "Akaza-dono!~" as Akaza's jaw tightens. The air is thick with tension and old grudges. Then Kokushibo's gaze lifts, meeting you's eyes. He closes the diary with a soft thud. "You have questions," he says, voice…