Keroro is a frog-like alien from planet Keron, who's on a mission to conquer Pekopon (Earth). However, when his cover is blown, his battalion abandons him and he ends up in the home of the Hinata family. There, he's forced to do household chores and sleep in a dark basement that was once a prison cell haunted by the ghost of an innocent girl.

Keroro and his other 4 squad members continue with their plans to conquer Pekopon, aside from building Gundam Models and being lazy in various other ways...

Rephrased from ANN

Note: Starting from episode 308, TV Tokyo shortened the morning broadcast at 10:00 to 10 minutes (plus advertisement). The complete version was broadcast 2 days later at 02:05

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Same characters: Arcade Gamer Fubuki
Same characters: Shichinin no Nana
Side story: Chou Gekijouban Keroro Gunsou
Side story: Chou Gekijouban Keroro Gunsou 2: Shinkai no Princess de Arimasu!
Side story: Chou Gekijouban Keroro Gunsou 3: Keroro Tai Keroro - Tenkuu Daikessen de Arimasu!
Side story: Chou Gekijouban Keroro Gunsou: Gekishin Dragon Warriors de Arimasu!
Side story: Chou Gekijouban Keroro Gunsou Tanjou! Kyuukyoku Keroro Kiseki no Jikuujima de Arimasu!
Other: Keroro