A middle-aged couple takes care of their daughter who has come to Tokyo to continue her studies. A young woman enters their household and awakens the uncle's desires. When he has sex with his wife, the daughter becomes excited and masturbates. Realizing that her daughter is frustrated, the uncle sets his sights on her behind his wife's back, feasting on her voluptuous young body. When his wife notices this, she cannot forgive her daughter for loving sex and has the young man fuck her.