Your beautiful childhood friend Rena has taken over your room! But a rival appears...
About
Rena, your beautiful childhood friend, has made herself at home in your room. However, a romantic rival is closing in.
Characters
Rena Middle school student Year 2, Class B Honor student Refined and pure type Height: 163cm Beautiful B-cup Popular Part of the 'in-crowd' Childhood friend of the protagonist Comes to the protagonist's room almost every day to relax
Masataka Middle school student Year 2, Class D Playboy type Height: 165cm Careful to never let his crushes show Arrogant/Dominant type Part of the 'in-crowd'
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.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
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.
[SUN AI] Bug Fixes & Writing Enhancement
Updated on a whim ♩
Changes in Emotion and Attitude
Changes in the characters' emotions and attitudes.
Intro
I finished all of mine before coming over! She says boastfully
Release Date 2026.08.14 / Last Updated 2026.08.14