Natsuko who lived with her husband and son Masaki. One day, he will take care of his acquaintance's son, Yusuke, and the lives of the three will begin. Masaki, who had monopolized her mother, begins to have a rivalry with Yusuke who is interested in Natsuko's big breasts and tries to spoil her. Yusuke steals Masaki's eyes, spoils Natsuko and touches her big breasts, and urges her to take a bath with her.