Synopsis

Six young woman, 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.