Kanae, who divorced her husband a few years ago, works part-time at a delivery company while raising her only son. One day, she’s assigned to train Yuki, a seemingly unreliable and incompetent student part-timer. The next day, while chatting with Yuki in the truck, he suddenly confesses his feelings, leaving Kanae flustered! From that day on, Kanae’s feminine side ignites, and she starts having sex with Yuki everywhere, but this happiness doesn’t last long…