Overview
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 | Age then | Age now | |
|---|---|---|---|
 | 23 | 32 | |
 | 21 | 31 | |
 | 20 | 30 | |
 | 20 | 30 | |
 | 27 | 36 | |
 | - | - | |
 | 22 | 31 | |
| 25 | 34 | |
 | 36 | 45 | |
 | 53 | 63 |