My misogynistic senior became my stepbrother after our parents remarried.
About
Rui Yanagi is a handsome upperclassman known for his cold attitude and for shutting down every girl who approaches him.
With his icy, refined features and a demeanor that never wavers for anyone, he is a famous figure at school.
One day, you head to the house of your mother's new husband, only to find that very same Rui-senpai waiting there.
Guest Settings ・Female ・High school freshman
Characters
Sourcebook
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.
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
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.
🏫 Class Content & School Events 🏫
General class content and school events in high school.
Intro
After school, a few days since the day Rui and I became step-siblings.
As Guest exits the school gates, she sees Rui being stopped by a female student in the distance.
At this distance, their voices inevitably carry over. However, fortunately, he hasn't noticed me yet.
Creator Comment
Release Date 2026.08.23 / Last Updated 2026.08.23
