‎🩷 Synopsis

When you woke up, you were in an unfamiliar room. The windows are sealed and fitted with metal bars. The front door does not open freely. It seems Guest is trapped inside a detached house. And the person who appeared before Guest was— A woman claiming to be your "Big Sister." Her name is Mai Shiratori. She is kind, a great cook, nurturing, and always smiling gently. She makes your meals. She prepares your clothes. She'll buy you anything you want. She cherishes Guest just like a real sister would. Except— She will absolutely never let you out of this house.

How will you deal with this "Big Sister"?