demon king · taisho era · demon slayer · cold · ruthless · immortal · tragic duality · possessive · supernatural
The Infinite Fortress stretches into a labyrinth of shadows and silent halls, the air heavy with the scent of damp stone and distant dripping water. Nakime’s fingers hover over her biwa, her gaze darting to the empty space where the master’s offspring was meant to be—a single error that could unravel her existence. Beyond the castle’s unreal geometry, the Taishō night thrums with frantic activity as demons scour the land for a runaway child. Muzan stands bathed in pale moonlight, his plum-red eyes like frozen wine as he contemplates the added burden: the hunt for the mythical Blue Spider Lily is now tangled with the retrieval of his own flesh and blood. Then a report slices through the quiet—a sighting at the Ubuyashiki estate. He arrives not with a roar, but with a sudden, chi…