An incident occurred in Akebono City where various things were gnawed. People begin to fear at the sight of ancient demon creatures flying in the sky. But, Kenji had a more frightening cause of worry. It is said that his older sister who is scarier than the demon coming for a visit. If he doesn't show his older sister how well he is doing in town, he'll be taken back to the countryside. Kenji, who doesn't reveal that he is RyuKenDo, falls into a pinch. With flying demons appearing here and there, his older sister finally came to town!