Kimika is a single mother who has raised her son Ikki. She works day and night to help Ikki advance to higher education. One day, Sayama, a man who has had feelings for Kimika for a long time, pressures her into marriage. To her dismay, Ikki witnesses her giving her body to Sayama. In order to correct her out-of-control son's sexuality, Kimika tries to give him a sex education, but...