Ep. 1: Sergeant Keroro, a Keronian alien, is captured by the Hinata family and forced into domestic servitude on Earth.
Sergeant Keroro, a frog-like extraterrestrial from Keron, arrives on Earth, known to his species as Pekopon, with orders to invade. Instead of conquering the planet, he is captured by the Hinata family and reduced to a pet tasked with household chores. The family includes the paranormal enthusiast Fuyuki, his hot-tempered sister Natsumi, and their mother Aki, who works as a manga editor. Keroro occupies a basement room that he renovates into a command center, unaware it is haunted. A prequel segment depicts the family’s initial discovery and capture of Keroro during a scouting mission. Fuyuki mishandles the Keroball, Keroro’s weapon, inadvertently transmitting a signal to the Keronian fleet. The fleet abandons Keroro rather than rescuing him, leaving him to serve the Hinatas.
Episodes
- Ep. 1 · Sergeant Keroro, a Keronian alien, is captured by the Hinata family and forced into domestic servitude on Earth.
- Ep. 2 · Keroro Robot Activates, Sir! Cherry Blossom Invasion Front, Sir!
- Ep. 3 · Pururu serves as Chief Nurse, Sir! / Natsumi shares today's horoscope, Sir!
- Ep. 4 · Giroro sets traps for the Hinatas while Keroro becomes berserk due to humidity changes.
- Ep. 5 · Keroro: Heated Card Battles, Sir! / Keroro: The Targeted Platoon, Sir!