The First Investigative Division is the star unit of the Tokyo Metropolitan Police Department. Jun'ichi Ōiwa, the head of the division, leads around 400 elite detectives. He has an extremely heavy responsibility: attends initial investigations at the scenes of all brutal crimes that occur within the metropolis, decides on the course of action of the investigations at the same time as he directs many investigation task forces and gets into investigations himself at the critical phase. However, Ōiwa is definitely not a superman. Amid his suffering, Ōiwa overcomes this grave responsibility and is quite simply a "life-size hero" and "ideal boss" to his subordinates.

From a first feature director Koichiro Oyama who worked as an assistant director for Hideo Nakata's "Kaidan" (2007), the film is about a man with crime records living with his own son without knowing their real relationship. Starring Ikkei Watanabe "Suspect X", the film won Yubari International Fantastic Film Festival's Audience Award, whose last year's winner was a smash hit zombie film "One Cut of the Dead".

Yuko Tanaka, who "married into" the Tanaka family, a family running a poultry farm, led a modest life despite being mistreated by her sister-in-law, Satomi Tanaka. One day, Saki Watanabe, the mistress of Yuko's husband, Ryosuke Tanaka, applies for a live-in employee position at the poultry farm. Unaware that Saki is her husband's mistress, Yuko, who conducts the interview, decides to hire her. Thus begins a strange cohabitation, including the husband's mistress.