Nana, who lives with her frequently traveling father, spends most of her days like she's living alone. Although Nana was a quiet and excellent student, she had a habit of fantasizing about sex with older men and indulging in self-pleasure. One day, a neighbor named Masakazu, who brought around a noticeboard, assaults her while she sleeps and has sex with her. This becomes the catalyst for Masakazu's brother, Tarou, and Tarou's middle-aged delinquent boss, Hirai, to set their sights on her, leading Nana down a path of debauchery…
