Hatsuko, who is poor and has no friends, finds emotional support in Mishima, a boy in her class, who helps her with her study to go to a high school together. However, Hatsuko's brother causes trouble at the factory and gets the sack. Hatsuko gives up her dream of going to high school.

17 year-old Hiruma is desperate to get laid and takes out his sexual urges on Anpai, a fat boy who has "boobs." His classmate Tomono, a sickly loner, is in a serious relationship with their married teacher.

When an alluring young woman joins an erotic writing class, she begins a game of sexual cat and mouse with a naïve college student. As they venture into more and more unpredictable territory in the bedroom, he begins to think she might be using him as a test subject for her fiction more than anything else.