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.

Little Trip: Chairperson Ayako and Yuki, who sometimes skips school, become close. They run away. Rakugaki Uwagaki: Satomi used to be a member of art club, but she stopped drawing. Due to a cultural festival, she decides to draw again. Baion: Kuroi likes recording the sounds of daily life. One day, she meets Rika. Rika begins to enjoy recording the sounds of daily life with Kuroi.