Six young women, including Katsuki Takahashi, hold a high school reunion, but their high school has been shut down. The women are happy to see each other again. Suddenly, a shot rings out and one person dies. They receive a text message from Natumi Shirakawa who died 7 years ago. The text message asks "who is the criminal?" To figure out the identity of the perpetrator they look back at what happened 7 years ago.
| Actor | Role |
|---|---|
 Minami MinegishiKatsuki Takahashi | Katsuki Takahashi |
 Riho TakadaMifuyu Tachibana | Mifuyu Tachibana |
 Erina NakayamaTakako Minefuji | Takako Minefuji |
 ShioriErika Uchida | Erika Uchida |
 Ayana SogawaArisa Kida | Arisa Kida |
| MMika UshioYuka Kawasaki | Yuka Kawasaki |
 Ami TomiteAki Yazawa | Aki Yazawa |
| TTaiyo AyukawaNot listed | Not listed |
 Ryohei AbeNot listed | Not listed |
 Toru KazamaNot listed | Not listed |
| RRuikaNot listed | Not listed |
 Ryutaro MaedaNot listed | Not listed |
 Naoki TakeshiNot listed | Not listed |
 Yuka YoshimuraNot listed | Not listed |