Shinjuku Punch.

Hosei Dojo is 22 years old and he has yet to have sex. Even though he likes women a lot, he has always had bad luck with them. Wishing to experience a big change in his life, Hosei goes to the Kabukicho. The area is a red-light district in Shinjuku, Tokyo. There, he meets Rumi Itoda who works at a hostess bar and falls in love with her at first sight. He learns that she suffers violence from Takashi Takaoka who works at the same bar. Hosei tries to help Rumi escape from her situation.