A frog alien who was supposed to conquer Earth is too distracted by plastic models and actual friendship to bother. The movie takes that joke and runs with it, finding genuine warmth in the spaces between the absurdity. You're watching something that knows exactly how silly it is, commits to that silliness without apology, then sneaks in a moment where you actually care about a kid and his weird green best friend.
A frog-like alien soldier and his squad landed on Earth years ago with conquest on their minds, but got distracted by snacks, video games, and human friendships instead. Now Keroro spends his days hunting for Gundam model kits with his best friend Fuyuki, a local kid whose family unknowingly harbors an alien platoon in their home. When Keroro and Fuyuki accidentally smash an ancient vase at a dusty shrine, something catastrophic breaks free. Kiruru, a sealed weapon from Keroro's home planet, awakens and begins warping reality across the town. People vanish. Buildings twist. The world lurches toward destruction, and no one understands why. A mysterious girl named Mirara arrives with crucial information: she knows how to stop Kiruru and save Earth. But there's a catch, and it might force Keroro to choose between his adopted home and his alien heritage. What starts as a casual afternoon errand becomes a race against time where a comedic alien nobody has to act like an actual soldier.