A murder case takes place in 1985 in Tokyo. The victim is a writer. The man is dead. Tsutaguchi is in charge of the case. He contacts people who knew Ritusko. Tsutaguchi learns about the men around her. The men have different opinions of Ritusko. Tsutaguchi learned of a 1955 case in Tsugaru, Aomori Prefecture, where two people grew up. He thinks the murder of Kimizuka could be solved by that case.