Rei is a girl who lost her mother at a young age and lives in a single-parent household. However, her father is often away on business, so she lives almost alone. Although Rei is a quiet and good-student schoolgirl, she has delusions and masturbates while imagining being dominated by older men. One day, she is attacked in her sleep by Masakazu, a man from the neighborhood who brought her a notice, and they have sex. This leads to her being noticed by Masakazu's older brother, Ippei, a gangster, and Ippei's friend, the delinquent middle-aged Hito...