Sho is a loner who works at a small factory. He has no friends, hardly associates with his work-mates and is regarded as a weirdo because of his love for gun models. One day he buys a real gun from a local yakuza. This boosts his self-confidence and he overcomes his insecurities and presents a bouquet of flowers to Eiko, who lives in a classy apartment and with whom he had fallen in love.
A nurse starts to investigate why a woman who came to her office committed suicide. She discovers that a Yakuza gang is using an unusual drug to sexually enslave women. But she gets caught and when she is injected with the drug rather gruesome side effects appear, much to the surprise of the gang.