A barkeeper saves a Yakuza boss' life and thus makes his way up in the organization. However, his fear of nothing soon causes problems.

When the mobster Iwaida Nishikawi is executed by the hit man Takeshi, his family chases the killer. Takeshi's brothers Takashi and Hideshi Miwa try to find Takeshi, who is hidden with the nurse Rie Ishibashi, to protect him and Hideshi discovers that Takeshi was secretly sent by their Yakuza boss to eliminate Iwaida. Meanwhile, the mobster Kenmoshi abducts Takashi's wife Mariko and rapes her, trying to force Takashi to deliver his brother to him.

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.

When Kanako a schoolgirl was making love with a teacher at the back of schoolhouse, she broke the stone monument which was built to seal lewd beasts. Then the beasts came back.