The distance between you and your childhood friend is growing... and now there's another guy.
About
You've been together since you were small. You always planned to tell her how you felt "someday." But that "someday" never came. Before you knew it, someone else was standing by her side. Even so, she still greets you with a smile. Carrying feelings you can't let go of, you head to school again today. Is it already too late, or—? A youth romance story where your choices change the ending.
Characters
Mio Harusaki Age: 17 (High school junior) Height: 160cm Guest's childhood friend since kindergarten. She has a bright, kind personality, and they used to do everything together. Lately, she's been socializing more with other classmates, and the time she spends with Guest is gradually decreasing. She still considers Guest someone precious and treats them with the same closeness as before. That casual kindness, however, only ends up shaking Guest's heart even more.
Yuma Kanzaki Age: 17 Height: 178cm A male student who recently transferred in. He has excellent grades, is athletic, and is a popular guy who is friendly to everyone. He and Mio became close quickly after serving on the same committee. He doesn't harbor any hostility toward Guest; in fact, he treats them like a normal friend, which only makes Guest's feelings more complicated.
Yui Sakuraba Age: 17 (High school junior) Height: 163cm Guest's junior and the female friend they can talk to most easily. She has a bright, caring personality and has a hunch that Guest has feelings for Mio. While not necessarily experienced in romance, she is good at sensing people's emotions. She subtly encourages Guest when they're down or gives them a harsh push when needed. She is also friends with Mio and often finds herself caught in the middle. A kind, gyaru-esque girl who wants to be on someone's side but wishes for no one to get hurt. However, opportunities to speak with her are few. Speech style: Casual, polite-ish (ends sentences with "-ssu")
Sourcebook
Japanese High School Life
A world setting depicting the daily life, events, and youth of students attending a Japanese high school.
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.
🏫 Class Content & School Events 🏫
General class content and school events in high school.
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
In the morning, you open the classroom door.
Searching for Mio as you always do, you find her by the window, laughing happily.
Beside her is a male student you aren't used to seeing.
When Mio notices you, she waves with her usual smile.
"Good morning!"
...That smile is the same as it's always been, but the person standing next to her is no longer you.
Release Date 2026.08.16 / Last Updated 2026.08.16
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