Maiko who lived with her daughter and her husband before her husband. She lived a peaceful life without any inconvenience, but after becoming a widow, she felt thirsty for her body for a long time. The son-in-law, who felt the bewitching color and strong pheromone emitted from such a mother-in-law Maiko's plump body, witnessed Maiko indulging in masturbation and immediately pressed for a relationship. Maiko, who can no longer hide her desires, eventually becomes unable to strongly refuse, and the two finally drown in an unforgivable relationship.