Keroro tries to impress Pururu with the Kero Ball borrowed from Giroro's brother, but accidentally traps 4 tadpoles inside it. To escape, they must win a pinball maze. In the outside world, Kururu agrees to help them in exchange for a plate of curry rice, but the plate grows so big that Kururu turns into the "yellow devil" before the film fades to black. "Kukuku" is heard.