A father-in-law who fell in love with his son's daughter-in-law, Naoko, who should never be interested. Father-in-law observes Naoko's life and delusions. I also took a peek at sex and masturbation with my son. One day, my father-in-law who looks into masturbation was called by Naoko ... "Dad, I knew I was peeking all the time." But Naoko invites her father instead of getting angry.