Tokita Shingo is a detective who gives up on a successful detective career. He teams up with up with rookie detective Shiina Asobu. They work on an undercover investigation into a drug case and soon find themselves in an unexpected situation.
Detective Tokita and his partner, Shiina, miss an important suspect. Tokita pursues a street musician, but she causes trouble that leads to a brawl between the Yakuza and Chinese mafia! Misato and Arira chase after Yotsukado and Tokita, but get sidetracked. A pair of detectives who will be fired if they don't catch a Yakuza boss and out-of-control female officers, create suspense and comedy!