[APNS-198] I don't know the teacher or my classmates. I want to Oji-san who seems to be unpleasant to death.

Nana, who lives with her father, who is on a business trip, lives almost every day like living alone. Nana was a mature and honor student female student, but she has a delusional habit, imagines an etch with an old man, and is addicted to masturbating. One day, a man in the neighborhood who brought a round board, Masakazu, is attacked and has sex. In the wake of that, Taro, who is Masakazu's older brother, and Hirai, a bad middle-age man who is Taro's boss, are also looked at, and fall into the days of lewdness.