A few years ago, Junya lost his mother and lived alone with his father. - It was late summer, when Junya was about to take his entrance exam, that his father brought Mayu, his new partner. - For Junya, living with Mayu, who is too young to call him a mother, was a series of confusion and temptations. - It is inevitable that a boy who has just hit puberty will realize that his young mother-in-law, who suddenly appears, is a woman.