Sawaki is a postman who's not quite thrilled about his boring way of life. But his life is about to change when he delivers mail to his old schoolmate Noguchi, who's now a member of the Yakuza, the Japanese Mafia, and just finished cutting his little finger off.

A would-be bank robber forgets his mask on his first big heist, and then botches an attempt to shoplift a replacement mask from a nearby convenience store. The store's clerk, a washed-up rock star, chases the thief and literally runs into a Yakuza to whom he owes money. Thus begins an all-night, three-way pursuit through the streets of Tokyo.