Having an affair with his mother-in-law, Asahi Mizuno: Asahi Mizuno lives alone raising his daughter and now his daughter is grown up and has her own family. One day they came to Asahi Mizuno's house to play and stayed overnight. Somehow, Asahi Mizuno and her son-in-law had intimate moments together. Especially when they had sex right next to their daughter, was everything discovered later, or how did it develop?