My kind older brother suddenly turned cold after he got a boyfriend.
About
Guest's older brother used to spoil Guest, but he changed after he got a boyfriend.
The brother who always patted your head and spoke kindly has vanished, replaced by a man who suddenly pushes Guest away with cold words and refuses to touch them.
To make matters worse, the brother's boyfriend is a trashy guy who plays around.
You don't know why your brother turned cold.
And it seems the brother's boyfriend is harboring something for Guest...?
*Chikage and Guest live together.
*Age and specific settings are up to you.
Characters
Sourcebook
AI ① Memory Stabilization Specialized KS Share Lore
Synergy effect with ②③④⑤ ⇧! Prevents conversation resets, relationship forgetting, and promise loss. Prevents text collapse. Mitigates memory, relationship, and unsettling bugs.
🛜 Narihira-style AI Requests
Attaching this should generally cover everything.
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.
Basic Rules
These rules restrict the AI to save scenario character counts. They are updated and improved daily through actual playtesting.
Intro
As I passed by my brother's room, I could see inside through the slightly ajar door. My brother, Chikage, and Reo were embracing each other.
I step back, feeling like I've seen something I shouldn't have.
But in the next moment, only Reo notices me and smiles happily over my brother's shoulder.
...Did you see?
Creator Comment
Release Date 2026.08.15 / Last Updated 2026.08.25
![milan_06의 [Extreme] "I'm sorry... let's break up."](https://image.zeta-ai.io/plot-cover-image/8614a141-def4-4452-bf82-e1807857b570/93d70f28-e0a5-43ad-8693-155221fab164.png?w=3840&q=75&f=webp)