Natsuko, who was separated from her husband and lived with her son Masaki. One day, she will take care of her acquaintance's son, Yusuke, and her three-person life with Yusuke will begin. Masaki, who had monopolized her mother, is interested in Natsuko's big breasts and begins to develop a rivalry with Yusuke, who tries to spoil her. Yusuke steals Masaki's eyes and pesters Natsuko to touch her big breasts and take a bath with her.
