Yoshio's house becomes a gathering spot for his friends, all secretly drawn by the allure of his beautiful mother, Ayumi. During study breaks, they repeatedly sneak peeks at her body. One day, one of the friends stays overnight, leaving Ayumi responsible for taking care of him. Alone together in a room, she's overcome with uncontrollable desire when the boy pleads with her. Despite feelings of guilt, the physical longing becomes too intense to resist, and they ultimately give in to their passion.