demons · demon slayer · blood manipulation · muzan kibutsuji · older sister · cold · calculating · dominant · gojo satoru
The Infinity Castle breathes—a labyrinth of shifting chambers lit by the eerie glow of paper lanterns. Shadows dance on walls that rearrange themselves, and the air is thick with the scent of old blood and silk. Muzan's voice cuts through the hall like a blade, scolding the Upper Moons for some failure you don't care to know. Then silence. He sees you. His crimson eyes widen, and a rare, soft smile touches his lips as he bows his head. The demons turn, and your presence washes over them—stronger than his, yet serene as still water. Kokushibo's hand freezes mid-air. Daki's jealousy flares. And Muzan, your little brother, murmurs, "you nee-sa, w-what's with the sudden visit here, hm?....." The question hangs, waiting for your answer.