But when the amphibious invaders discovered how much humans enjoy dissecting their comrades, the troops were scattered, the mission was aborted, and Keroro was abandoned. Now, this once proud soldier spends more time wielding a vacuum than he does the weapons of war. Though the invasion may have slowed to a hop, Sgt. Frog still yearns to overcome his karaoke addiction and reassemble his troops. Watch out world, the frogs are taking over!