When he transfers to a certain school, he finds out that he is the only guy there! Shinji is alone and unable to make any friends at such a school, but then his classmate Hana talks to him. Just when he is excited to have made his first new friend, she confesses to him that she is involved in prostitution to protect public morals... To help with her activities, Hana decides to engage in naughty activities with Shinji!?