Mitsuyo started yoga to relieve her lack of exercise.She enjoys sex for the first time in a long time with her husband who is excited by the appearance.Another day, she started yoga again and Mitsuyo changed into spats.Her son gets excited about her appearance and her crotch aches.Mitsuyo, who doesn't notice her son's estrus, invites him to "exercise together", but she is her son who is horny.She became impatient with her mother's extreme poses and ran out of control, saying, "You're inviting me!"I push down her mother and violate her.From that day on, her son steals her father's eyes and seeks Mitsuyo's body...