Having lost his mother at a young age, Masato spent his days juggling school and household chores while living alone with his father. His life changed at the end of summer when his father brought home his new wife, Yuri. This was precisely when Masato was preparing for his entrance exams. For Masato, who had grown up as a boy, life with this suddenly appearing young stepmother began with shyness and confusion. Yuri's scent, her gestures, her gentle and warm voice, and her soft body—gradually, as a boy entering puberty, Masato began to see his stepmother as a woman, a natural progression of his awakening desires.