A step father-in-law falls in love with his step son's step daughter-in-law, Naoko, who he should never be interested in... The step father-in-law observes and fantasizes about Naoko's life. He also peeps into her sex and masturbation with his step son. One day, the step father-in-law, who was peeping at her masturbation, was approached by Naoko... "step Father-in-law, I knew you were peeping at me all along." However, instead of getting angry, Naoko invited her step father-in-law...