Rieko, who lost her husband, lives in a single-parent household. She puts all her energy into her work and housework so that her son doesn’t lack for anything, and puts her own needs second. Her son has successfully entered high school and is quite popular in his class, so her mother is relieved. When her son, whom she is so proud of, asks if he can let his friend stay over, Rieko immediately says yes… She never imagined that this would lead to her being raped by her son’s friend and becoming a cock-crazed maniac…