The main character is Isamu (Hideaki Machida), a sixth grader . Isamu lost his mother in a car accident when he was young. He couldn't forget that, and he couldn't forgive people who didn't follow traffic rules. Today too, Isamu keeps the yellow flag, a memento of his mother, and makes him guard the traffic lights. He doesn't mind paying attention to adults. Everyone calls Isamu a traffic light idiot , but Isamu doesn't care. It was decided that Isamu would have a new mother. Never admit it! Isamu refuses. But when she learns that her new mother also lost her family in a car accident, she gradually opens up. Eventually, Isamu realized the importance of "caring for the other person's feelings" and realized the mistake in his own way of doing things.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.