Serial murder case x female secretary disappearance case. Uncover the hidden truth from two intertwined perspectives.

A series of murders have been occurring mainly in Marihamadai since last year. Detective Otonari, who is concerned that the victims have no connection with each other and that there is no clue to solving the case, asks his assistant detective Sagishima Izuna to join the police in their investigation.

Meanwhile, scriptwriter Ikuo Masao, who is almost forced to take on work for the detective agency, receives a request from a certain company to search for someone. The woman who is the subject of the investigation, Hamakawa Yumiko, is a contract employee working in the secretarial department. After working for a month, she suddenly becomes unreachable...

Izuna and Ikuo. The two encounter two cases. What is the truth that awaits them at the end?