Matt Kelly is a recently discharged U.S. Marine living in the city of Shimbashi, Tokyo. He has started a new life for himself. While enrolled at Sophia University, Kelly focuses on his two passions in life; kickboxing and women. The second passion sometimes gets him into trouble. One evening while Kelly is out bar-hopping in the Ginza district of Tokyo, he meets another American who is looking for his girlfriend Mariko. One thing led to another and Kelly decides to help the American look for his girlfriend. Well, this unlikely situation pushes Kelly into a role he never anticipated, as a private detective. While looking for this girlfriend, he falls into several interesting or should he say dangerous situations that involve counterfeiting, smuggling, North Korean spies, yakuza, a few killings, and an unusual cult. And, of course, unbeknownst to Kelly, he becomes involved with the fairer sex that works and plays in the Japanese hostess bars and strip clubs that make up the unusual world of mizu-shōbai or the night time entertainment business of Japan.