Yamada, the middle-aged caretaker, finds his life transformed by a passionate encounter with the enchanting Hina, a student at Seika Jogakuin. Their secret affair deepens as they explore forbidden desires with intense, intimate moments. Despite the risks, a tender romance blossoms between them, driven by mutual yearning and emotional connection. Their relationship grows bolder, filled with whispered confessions and unrestrained passion, as they surrender to their shared ecstasy.