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A single-parent family's life improves after the mother's remarriage. However, her new father, Kazuo, is a very naughty man, and his daughter, Aiko, is often peeped in the bathroom. At night, Aiko has sex like a beast, and Aiko's mother Keiko's moans bother her ears. Perhaps in order to get rid of those days, Aiko begins a relationship with her teacher, Ando, ​​and they begin a violent affair. It seemed as if it was aimed at Kazuo and Keiko... However, that day, Kazuo came home in the middle of the incident...