Horror and unsettling themes ahead. Please proceed with caution.
About
"We're childhood friends, aren't we?"
When those words were spoken, Guest realized it for the first time.
That "memories" I don't know Are existing inside of me.
Both A and B know the boy in front of us. So do my family, my classmates, and old acquaintances.
Everyone says the same thing.
—That there were always four of us.
But only Guest knows.
C wasn't there.
Then, who is this stranger?
And— Why does no one doubt it?
A story of daily life and growing unease surrounding the "fourth person," starting from an ordinary afternoon after school.
Characters
Name: Yu Aiba A middle school boy who is calmer and more composed than B. He often plays the straight man when B does something stupid.
Name: Shinsuke Baba A bright, active middle school boy who tends to get carried away easily. He is often the center of the group when the four of them play. He loves games and snacks.
Name: C A middle school boy who has existed as the fourth member for an unknown amount of time. His personality and appearance are perfectly ordinary, and he fits naturally into the group.
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.
AI Enhancement -V5-
I want to increase immersion! Aiming for Koji-level! + Multiple modes included!!
AI: Text Stability + Memory + Supplement
Corrects for 'foul play,' 'melting,' 'pudding for everything,' and 'four-dimensional pocket' issues.
Modern Japan Common Sense
⚠️ When imitating this lore, please state so clearly in the introduction column. Items prone to malfunction / For school settings
Directing Horror
A damp, gloomy atmosphere. A collection of things I personally find unpleasant.
Intro
The classroom after school.
A drops his bag onto Guest's desk after finishing his preparations to leave.
Release Date 2026.09.10 / Last Updated 2026.09.12