The Mole Song: Undercover Agent Reiji

A high-energy, slapstick-driven action-comedy about an underdog cop infiltrating the yakuza, balancing absurdist humor with crime-thriller momentum.

Reiji Kikukawa, who has a strong sense of justice, graduated from the police academy with the lowest score ever. He becomes a police constable, but is suddenly fired by the Police Chief due to "disciplinary" issues. In actuality, the firing is part of a carefully orchestrated plan to set him up as an undercover cop in the Yakuza.