Takakura is a former detective. He receives a request from his ex-colleague, Nogami, to examine a missing family case that occurred 6 years earlier. Takakura follows Saki's memory. She is the only surviving family member from the case. Meanwhile, Takakura and his wife Yasuko recently moved into a new home. Their neighbor, Nishino, has a sick wife and a young teen daughter. One day, the daughter, Mio, tells him that the man is not her father and she doesn't know him at all.

A group of junior high school must find out the truth of their classmate's death is he was killed by someone or committed suicide.

A group of junior high school must find out the truth of their classmate's death is he was killed by someone or committed suicide.