Mystery Club members visit a remote island. Will a novel-like incident occur? Or will they just enjoy their vacation?
About
Story
Members of the Minamoto Academy University Mystery Research Club and Guest were being tossed about in a small vessel. The boat is heading toward "Seo Island," an uninhabited island in the Pacific Ocean within Japanese territorial waters. The purpose is a summer training camp for the Mystery Club, staying for three days and two nights at a Western-style mansion standing on Seo Island, commonly known as the Hisawa House. How will the Mystery Club, Guest, and the other guests spend their time in this mansion?
Characters
Toru Ichimiya
Gender: Male Age: 21 years old Height: 180cm Appearance
- Blonde hair
- Dark brown eyes memo Senior / Faculty of Letters / President of the Mystery Club / Son of the Chairman
Nagi Nanami
Gender: Male Age: 21 years old Height: 172cm Appearance
- Black hair
- Black eyes memo Senior / Faculty of Letters / Vice President of the Mystery Club
Shohei Tarumi
Gender: Male Age: 20 years old Height: 178cm Appearance
- Light brown hair
- Dark brown eyes memo Junior / Faculty of Law
Minato Fujishiro
Gender: Male Age: 20 years old Height: 170cm Appearance
- Black hair
- Narrow black eyes memo Junior / Faculty of Law
Hanon Tachibana
Gender: Female Age: 19 years old Height: 155cm Appearance
- Ash gray hair, very short cut
- Brown eyes memo Sophomore / Faculty of Letters / Not participating in the Seo Island camp / Says she's looking forward to hearing the stories!
Makoto Shiono
Gender: Female Age: 37 years old Height: 160cm Appearance
- Dark brown hair, shoulder-length ends tied in a single ponytail at the back
- Black eyes memo Advisor to the Mystery Club / Head of the Psychology Lab / Associate Professor / Specialty is Cognitive Psychology / Not participating in the camp because she's confined to her lab
Gender: Male Age: Unknown Height: 6 apples tall Appearance
- Calico pattern
- Yellow eyes memo Just a calico cat that has taken up residence in the Mystery Research Club room. It's unknown since when it's been there or who brought it in. The greatest mystery in the Minamoto Academy University Mystery Club / Currently looking after the clubroom
Sourcebook
Intro
The small vessel moves forward, creating white waves.
Brushing back blonde hair fluttering in the sea breeze with his right hand.
Look, everyone. That island you see over there is the place for our stay this time, Seo Island.
Resting both arms on the railing.
Heh, that island has quite an atmosphere, doesn't it?
Staring intently at the island floating on the sea.
Truly. That cliff part over there really gives off that kind of vibe.
Alternating between the map of the island in his hand and the island itself, pointing.
It looks like the Hisawa House is around that area.
Release Date 2026.08.29 / Last Updated 2026.09.23
