Jiu Li Sheng Fair (played by Kimura Takuya) was originally a third-grade teenager, but he passed the examination of the Ministry of Justice by mistake and became a qualified prosecutor. Although he holds an important position, he still can't change his bad habits in the past. He often wears jeans and a leather jacket and doesn't work alone according to the rules and regulations, so he often has friction with colleagues who value promotion opportunities. The story begins when he is transferred to the criminal department of the West Branch of the Tokyo District Prosecutor's Office.
In the new department, there is a female affairs officer named Gong Yu Wuzi (played by Matsu Takako). She always wanted to be a deputy prosecutor one day, so she always listened to her boss and was a typical career-oriented woman. Originally, she was glad to hear that an excellent prosecutor would be transferred to her department, but when she saw Li Sheng, who was untidy for a long time, especially his unprecedented way of handling cases, she was surprised and had many conflicts with him.
Other prosecutors, such as Meiling Nakamura (Nene Otsuka), the chief prosecutor, and Yoshiyama Gong (Hiroshi Abe), who has an affair with his boss, are enthusiastic about everything, big or small. They don't like the way of handling cases and his casual clothes. Only the second prosecutor of the new department, Li Guang Kojima (Kiyoshi Kodama), appreciated his strong sense of justice. As for Li Sheng, of course, he doesn't get along with his colleagues in the new department who are accustomed to doing things and attach importance to their background and promotion.