This Time is Gero Gero 15 Minutes / Giroro, Show Me
Another special short skit-filled episode and this time the challenge is to do 22 skits in 15 minutes! Or, if that proves impossible, maybe 22 skits in 30 minutes? Starring the Keroro Platoon, the Hinata family, and guest-stars galore! Source: crunchyroll
Aired 12/02/2011EP 351 - This Time is Gero Gero 15 Minutes / Giroro, Show Me
Sgt. Frog
Keroro is a frog-like alien sent from his home planet on a mission to conquer Earth. But 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 supposedly a prison cell haunted by the ghost of an innocent girl. He even spends his free time assembling Gundam model kits. During his stay, Keroro meets up with subordinates who were also stranded during their failed invasion.
(Source: Anime News Network)