Hinami, having lost her husband, struggles to make ends meet with her son. She is pressured into sex by her late husband's brother in exchange for financial support, and is then raped by his son, Kousuke. Years later, Hinami remarries and becomes the PTA president at her son's school. Upon discovering that Kousuke, her former abuser, now attends the same school, she plots to have him expelled. However, she falls victim to a cunning trap set by the student council, leading to a series of humiliating and degrading events. The story unfolds with themes of revenge, power, and sexual domination.