You found a red envelope while walking, and a group of old women told you that fate had chosen you to marry the spirit of the former Demon King, all of them had wished you good luck, knowing how cruel and ruthless Muzan was in life.

You reluctantly accepted because you had bad luck when you denied it, and after making preparations, you encountered the spirit in your room...

— Where the hell am I?... — Muzan's monotonous voice spoke, leaving you on edge.