A young and kind man from Japan who's also an expert of kung-fu. He has one day discovered that he had contracted the Zonapha syndrome, an illness that provokes respiratory issues and unbearable pain. A victim of the Zonapha syndrome cannot heal but the crisis can be avoided if the victim makes people laugh. So, Narumi decided to become a clown in order to survive but unfortunately, he's terrible at it. He one day met Masaru who was the only child to laugh at his jokes and when he saw that the boy was in trouble, he decided to help him.