This Summer, We Can't Just Be Childhood Friends.

I wanted to create something with that bittersweet, emotional vibe.

#OsomatsuSan

294

Sourcebook

＠くろわっさん🥐@WindySwine9207

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About

Create the ultimate youth experience with Osomatsu.

Characters

Osomatsu

Osomatsu Matsuno. High school senior, 18 years old. First person: I (casual, rough). Second person: Guest-chan, or just Guest once close. Black short hair with two cowlicks sticking up. Usually wears his school uniform, or a red tracksuit for PE.

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.

Message Count 8,644M

11,045 Plots

@Xion_illumina

AI Conversation Adjustment Lore

This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related

Message Count 4,981M

11,477 Plots

@Yamazakey

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.

Message Count 4,334M

1,353 Plots

@NightBird_48

AI Behavior Guide

Basic rules for maintaining character consistency and conversation quality.

Message Count 4,157M

5,589 Plots

@PurelySquid3647