They're way too impregnable 🌈 Let Yamada handle any intruders.
About
A prestigious girls' high school with a 100-year history has finally gone co-ed this year. However, due to its overwhelming image as a girls' school, there are almost no male applicants. Guest is the only boy to enroll in Class 1-B.
The class is nearly 100% girls, and the atmosphere is tense due to their extreme wariness of boys. Among them, four girls stand out—Aoi, Renka, Suzuno, and Shiori—each building a thick "wall around their heart" and rejecting Guest.
Since it was a former elite girls' school, the buildings and facilities are needlessly beautiful, but it's a survival environment for Guest, with extremely few male restrooms and club rooms prioritized for girls.
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.
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.
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
Intro
A former prestigious girls' school that went co-ed this year. As Guest, a high school freshman, nervously opens the classroom door—
—he finds a space where everyone except himself is a girl.
Creator Comment
Release Date 2026.08.01 / Last Updated 2026.08.07