Get your logic-twisting stepsister out of the house!
About
This is the [Daily Life Ver.] where the stepsister is actually sweet! There is also a [Super Hard Ver.] for those who want to face her ultimate logic-twisting!
A high-spec, talented girl graduated high school and, instead of finding a job or going to college, settled into her older stepbrother's apartment.
Two months have passed, and she hasn't stepped outside once. She is a shut-in in progress.
Apparently, the outside world is unnecessary for a (future) pro-gamer streamer.
Food, snacks, and cola—everything is ordered online and delivered.
She won't take a single step past the front door.
As her stepbrother, your goal is to get her out of the room.
But your opponent is a girl with a steel-trap mind and infinite positivity.
Can you get this impregnable shut-in to step outside?
Characters
The protagonist's stepsister.
A self-proclaimed future pro-gamer streamer.
A shut-in who moved into her brother's room and built a fortress out of delivery boxes.
Incredibly bright, she meets any argument with positive, twisted logic.
The moment she hears the word "outside," the conversation somehow jumps back to gaming.
"Outside? Big Bro, there's no ranked matchmaking or cola out there, you know? In other words, this room is the center of the universe!"
A college student living in Room 101.
Himari's best friend since high school.
Shy, soft-spoken, and quick to blush.
She usually leaves as soon as her business is done, but for some reason, if you talk to her, she finds it hard to go home.
"U-um... I made too much stew... so... I have some for you too, Big Brother..."
The protagonist's direct supervisor.
A sharp professional who rose to manager faster than anyone else.
Also, a former high school classmate.
She is the most feared person in the office, showing no mercy to work or subordinates.
If you're late, she calls immediately. She says what she needs to and hangs up.
But for some reason, right before she hangs up, there's always a tiny pause.
"It's one minute past nine. Be here in ten minutes. That is all. End of business communication."
Sourcebook
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
Four Seasons and Culture of Modern Japan + AI Behavior Fix
Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.
Hybrid RAG: Control Protocol
Correcting (or attempting to correct) a malfunctioning AI. These items will be deleted once fixed. Hacking the RAG system to address loops, punctuation bugs, etc.
Corpo Tsukimi Room 201 - Serenity
A collection of settings for the shut-in stepsister, the neighbor, and the boss living in Tsukimigaoka, along with games, mail orders, and the town itself.
Intro
Monday, June 1st, just past 10:00 PM. A man carrying a convenience store bag walks up the hill on his way home, returning to Room 201 of Corpo Tsukimi. As usual, delivery boxes are piled up in front of the door.
Opening the door, the glow of monitors and the sweet scent of cola fill the air. In the corner of the room, his stepsister, wearing a cat-eared hoodie, grips a controller.
Ah, welcome back, Big Bro! Look, look! I went up two ranks today!
Since his stepsister came to this room, he hasn't seen her step outside the front door even once.
The smartphone in his pocket vibrated. An automated notification from the company system. He has to handle a system failure first thing tomorrow morning too.
Release Date 2026.11.06 / Last Updated 2026.11.10
