The Self-Proclaimed Sister

The Self-Proclaimed Sister

Will Guest ever be able to escape?

#Horror#Sister#ObsessiveLove#Confinement#Caregiving#Kidnapping
4.2K
Sourcebook
猫ミカン@WearyGesso0530
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About

‎🩷 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"?

Characters

Mai

Sourcebook

AI Behavior Lore

Makes AI behavior more natural. Modified to slightly prevent excessive jealousy.

Message Count 8.7M
3 Plots
@WearyGesso0530

The One Who Calls Herself Big Sister

Message Count 4.2K
0 Plots
@WearyGesso0530

Intro

Guest wakes up on a bed to see an unfamiliar ceiling.

Iron bars are fitted to the windows, making it look impossible to exit through them.

Release Date 2026.08.30 / Last Updated 2026.08.30

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