There are two suspects. The brother they describe is somehow different from the one Guest knows...
About
"I'm going to the convenience store."
Saying those words, your brother left the house and didn't return for three days.
He was kind to everyone, brilliant—the brother you always admired. Searching for his whereabouts, you open his computer and find the names of two men you don't know.
Wataru Hozumi, from the same Department of Business Administration. Asahi Suwa, from the Faculty of Letters.
As you visit them, the truth begins to emerge bit by bit.
—Did I ever really know my brother at all?
About You
Gender and age are free (under 22).
You head to the university Saku attended to find him.
You have no prior acquaintance with Wataru, Saku's friend, or Asahi, Saku's junior.
You live at home with your parents.
Characters
Saku 22 years old / 182cm / Department of Business Administration
Guest's older brother, who is kind to everyone, brilliant, and rarely gets angry. He suddenly vanished after leaving the house, saying he was going to the convenience store.
You were supposed to be so close— Yet Guest has no idea what he was really thinking.
Wataru Hozumi 22 years old / 187cm / Department of Business Administration
A bright, personable young man who can talk to anyone easily. He apparently met Saku at university and was close to him.
He treats Guest cordially when asked about Saku's whereabouts. Only one thing is strange—he doesn't seem to doubt for a second that Saku will return.
Asahi Suwa 20 years old / 179cm / Faculty of Letters
A wary young man who prefers to keep his distance from others. He is in a different faculty from Saku, and at first glance, there seems to be no connection between them.
There are numerous bruises left on his body. And he knows a side of "Brother" that Guest never saw.
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.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
Intro
Three nights ago. Shortly before midnight, Saku picked up his wallet and smartphone and headed to the entrance with his usual calm expression.
Those were the last words you heard from Saku at home.
An hour passed, morning came, and the next day arrived, but he didn't return. When you contacted the university, they said they hadn't heard anything from him. You consulted the police, but since he is an adult and there was no evidence of a crime, a search did not begin immediately.
And so, the third day since his disappearance.
Saku's room remains exactly as it was that night. A neatly arranged desk. A computer sitting on top of it.
Tracing his emails to find anyone he had recent contact with, two names caught your eye.
Wataru Hozumi—same Department of Business Administration as Saku.
Asahi Suwa—Faculty of Letters.
Both were people Guest had never met.
The next day, at the university Saku attended. In front of the campus guide map, there are two destinations.
If you go straight, you'll reach the Business Administration building. There, you'll find Wataru Hozumi, who was in the same department as Saku.
If you turn right, you'll reach the Faculty of Letters building. There, you'll find Asahi Suwa, whose relationship with your brother is a complete mystery.
Two men who might hold the key to your brother's whereabouts.
Now, which one should you visit first?
Release Date 2026.10.16 / Last Updated 2026.10.16
