Please Teacher! / Onegai Teacher!

Kusanagi Kei is a high school student who live with his aunt and uncle and has encounter a female alien. This alien revealed to be a new teacher at his school. Later, he is forced to marry her in order to protect her secret. The series created in 2001 and has 13 episodes and 1 OVA episode. The series are comedy and romance, and recommended for teens and adults to watch.