Single-mother families improve their lives after their mother's remarriage. However, the new father, Kazuo, is a nasty man, and his daughter, Aiko, is often peeped into the bath. - At night, she has sex like a beast, and her mother, Keiko's voice, troubles Aiko's ears. Perhaps in order to dispel such days, Aiko has a relationship with her teacher, Ando, and develops a violent affair. It seemed as if it was an allusion to Kazuo and Keiko ... However, on that day, my husband came home in the middle of the matter ...