Uchurei!
Japanese title: ウチュレイ！
Alternative titles: Space Ghost!
Type: TV
Source: Original
Episodes: 12
Status: Finished Airing
Aired: Aug 9, 2009 to Sep 19, 2009
Broadcast: Unknown
Duration: 3 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Robot Communications
Producers: AC Create
Genres: Comedy, Sci-Fi, Slice of Life

The "summer supernatural teen comedy" revolves around an ordinary high school boy named Takashi who ends up living with a space alien's spirit (uchūjin no yūrei) after a strange incident. He names the creature "Uchurei" and plans to keep it as a pet, but becomes possessed by it. 

(Source: ANN)