Yumi, a former clothing designer, has married into the Sasaki family, who live with their father and son Ittetsu. A beautiful flower that bloomed in a family that had no femininity... Ittetsu, who is around the age, is fascinated by Yumi's too plump body, and his head is full of Yumi. Noticing Ittetsu's feelings, Yumi dares to seduce Ittetsu. Because Yumi loved younger boys.