O-Shin is a young brothel worker who, one night, helps a young samurai escape from his pursuers. Against the warnings of her fellow workers, particularly Kikuno and the brothel's owner, O-Shin falls in love with the samurai.

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.