Uchurei!
Genres: Comedy, Sci-Fi, Slice of Life
Type: TV, Episodes: 12
Aired: Aug 9, 2009 to Sep 19, 2009
Studio: Robot Communications
Source: Unknown
Rating: PG-13 - Teens 13 or older
Synopsis:
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)