Donbe plays spiteful pranks on the people of Penguin Village. He runs into trouble after failing to impersonate Miss Yamabuki to get the school's fish and Dr. Slump is mistaken for Donbe. As Donbe finds out how powerful Arale is, he gets his foot caught in a trap and reveals to Arale how badly humans treated him and his parents. Arale invites Donbe over to Dr. Slumps to receive medical treatment despite the trouble the fox caused him.