Detective Hasumi Kosuke rushes to the scene after hearing a suspicious man has fled after refusing to be questioned.

It's reported that a young woman's body has been found in the riverbed. Kakegawa, Hasumi and Mizuki arrive at the scene.

Detective Mizuki protects a little girl he found on the way home. The girl's finding her mother as she isn't home yet.

Former Superintendent Kuroishi commits suicide in his apartment. A few months ago, he resigned because of an affair.

Kakegawa is shocked that his former supervisor Fujihara who promises to confess his sin is shot to death by someone.

Kakegawa travels alone to Shunran in search of clues to a murder case from 10 years ago involving Kosuke's father, Yuto.