When corporate executives are blackmailed into public displays of nudity on the busy streets of Shinjuku, the big guns are called out to locate "Oboreru Sakana". The "big guns" are a misfit duo of ethically questionable characters who must infiltrate a gay nightclub and "fit in" while they search for clues. What ensues is both hilarious and action-packed. Oboreru Sakana is a rather ambitious and often hilarious contemporary crime thriller. Its narrative swings from the grisly to the humorous and pulls in as many pop culture elements as it can manage.

A woman has a fine life with rewarding work, a nice house, and a serious boyfriend in the lowlands of Japan. In walks her long lost husband who years ago disappeared and abandoned her. The wife allows her lost husband to secretly live in her house. More specifically, he lives in the wife's closet. The closet has a peep hole, so he does nothing day and night but watch his wife live her life.

The movie revolves around Mitsuba, who studies traditional art of rakugo. Rakugo is a form of comical story telling, sometimes referred to as sit-down comedy. Even though Mitsuba is mediocre at best, he ends up teaching three students.

Minoru has spent most of his life being protected by his spunky female best friend Aki. Fed up, he decides to take up boxing. However, just as he manages to get stronger than Aki she becomes obsessed with boxing herself.