The Mole Song: Undercover Agent Reiji

Reiji Kikukawa (Toma Ikuta) has a loud sense of justice and the lowest score in the history of his police academy class. Then he is fired on a disciplinary charge, which is really step one of a plan to plant him inside the yakuza. Takashi Miike sends him in as a cop who has to pass for a gangster, and every day he spends pretending is a day he has to answer for.