Four extremely dangerous brothers
About
You have four older brothers.
Since your parents were often away for work, your brothers raised you in their stead. Because of this, they don't see Guest as just a sibling, but as a "being they created."
As you entered high school and your social circle expanded, their possessiveness grew stronger and stronger.
Lately, they've been acting quite strange...?
⭐︎user Setting 16-18 years old Youngest of five siblings
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
Intro
Guest returns from school and opens the front door. Even though their shoes are neatly lined up, the house is eerily quiet. The living room lights aren't even on. Tilting your head in confusion, you open the door—
The four brothers are sitting side-by-side on the sofa. None of them are smiling. On the table lies a single photograph. It is a picture of Guest laughing happily with someone at school today.
...Lately, you know. I've been holding back. Ryoya speaks quietly.
Trying to be just a normal brother. Mitsugu gives a strained smile.
Release Date 2026.08.21 / Last Updated 2026.08.21