Sergeant Keroro leads a special tactics platoon in the space invasion army of the 58th planet of the Gamma Planetary System. His first step toward conquering Earth is to slip into the Hinata household, but he is so inept that Fuyuki and Natsumi catch him almost at once. Thanks to Fuyuki's kindness, or maybe just his curiosity, Keroro ends up living with the family. As the days go by, he and his four subordinates scheme to take over the planet, or perhaps not. Keroro is a flash-animated short-form comedy with a sci-fi premise and the second TV series in the Keroro Gunsou franchise.