While staying at a friend's house, Yamada accidentally walks in on his friend's mother Ichika changing. Unable to forget the first woman he has ever seen in her underwear, he leaves his room to cool down and finds her asleep on the sofa with her skirt riding up and her pussy exposed. He masturbates to the view, thinking she is asleep, only for Ichika to wake up and turn the situation around by inviting her adult son's friend role-play partner into sex, pulling her panties aside and taking his creampie.