From thugs to yakuza, Taiza Kujo wields the law to defend society's worst. Fellow lawyer, Karasuma doubts his ethics but joins him in facing the abyss.

Seeking a greater justice, a band of homeless assassins flays their human targets and delivers the tattooed skins as proof of a contract fulfilled.

他，是称霸一方，无数人闻风丧胆的黑帮一哥鯖島（高橋克実饰）。他，是善良荏弱，刚踏上职场不久的社会新鲜人城田（松田翔太饰）。这两个八竿子打不到一起的两个人，某日却因机缘巧合交换了身体！ 这看来无比荒谬的事，就连医生也无法解释。两人无奈地决定在变回之前先扮演各自的身份，于是， 鯖島变为儿童咨询救助中心的员工，面对中心里各类孩子的棘手问题，他毅然拿出老大风范儿，用他“与众不同”的另类风格一一完美解决，就有如传说中的那位拯救世界的骑士堂吉诃德！

20-year-old rookie police officer Kawai Mai works hard at a police box and feels both physically and mentally drained. She has never felt appreciated even though she supposedly works for the sake of the area’s residents. In addition, she does not find working at a police box rewarding. Mai is about to hand in her resignation when she meets 30-year-old Fuji Seiko, the former ace detective of the Criminal Investigations Division. Seiko is said to have been forced to transfer to the police box for harassing a subordinate at work but … … This encounter between Mai and Seiko will significantly change their lives as they are suddenly paired up. This odd pair struggle to help and support each other in cases, routine duties and romance?! And Seiko’s true reason for coming to the police box is revealed.