You smell it in the air and feel it in your bones. There's even a certain hop in your walk. Yes, indeed, summertime is finally here! But Keroro and the Hinata clan seem too busy to take notice of a little war of the worlds. As temperatures rise in the heat of battle, there's one cure for this group of hot heads: Soaking in a cool pool! Alas, there's just a little problem of shrinkage, and we don't mean from an alien member. So tune into your cosmic radio and broadcast to everyone you know—that giant sucking sound you hear is the latest in Keroro's new line of toys! But the question is: will we all make it through this adventure without croaking?

Rated: T