Good Boys, Bad Boys

"Are you a good boy? Or a bad boy?" 13 elementary school students gathered again at the class reunion, and a graduation photo album appeared in the time capsule, in which the faces of 6 people were blurred. Immediately afterwards, suspicious deaths occurred one after another among the students. Who is it? And for what? In order to prevent the tragedy from continuing, Takagi Sho (played by Shotaro Mamiya) and Saruhashi Sonoko (played by Araki Yuko) began to take action. However, they also hide their own secrets. The suspect is among the classmates. Who is the real culprit?