The opening credits of the third Keroro Gunsou movie, Keroro vs. Keroro: The Great Sky Battle de arimasu!, recapitulate the opening episodes of the TV series. It shows Natsumi walloping Giroro with a bookbag. However, in episode four, she defeats him with a leek. Why the change? Are the writers afraid that viewers will confuse her with Hatsune Miku? (Update: I rewatched the fourth episode, and she does use a bookbag as well as a leek. Never mind.)
