Yuri Ishikawa and her team try to crack unresolved cold cases in Kanagawa Prefecture, Japan.

A mysterious woman appears in front of Otaro Dojima. The mysterious woman has a pale face with red lips. She kisses him and he dies, but the next moment he regains consciousness. He realizes he is now seven days in the past. The mysterious woman also follows him. Due to her kiss, Otaro Dojima dies and goes back to the past over and over again.

27 year old Adachi Momoko lost both her parents in an accident when she was in third year high school. She then gave up going to college and has been working at a home centre for the past nine years while supporting her three younger brothers who are now 20, 17, and 14 year old respectively.

University student Sugishita Nozomi, Naruse Shinji, Ando Nozomi and Nishizaki Masato end up coming upon the scene of the murder of the Noguchi couple, because of a plan they had devised. Nishizaki is arrested at the scene and is given a 10-year prison term because of his voluntary confession. 10 years later, Takano Shigeru, a former police officer who has misgivings about the verdict of this case, starts to pursue the truth. He is convinced that it all began as a result of an incident caused by Nozomi and Naruse on an island in the Seto Inland Sea in the summer 15 years. “They committed a crime at that time. It was for the sake of each N.”