Please Teacher!
おねがい☆ティーチャー (original)
Kusanagi Kei, a high-school student living with his aunt and uncle, has an encounter with a female alien. This alien is revealed to be a new teacher at his school. Later, he is forced to marry this alien to preserve her secrets. From there, various romantically-inclined problems crop up repeatedly.
Starring Rei Sakuma, Ayako Kawasumi, Tomoko Kaneda, Kikuko Inoue, Satomi Korogi, Naoya Uchida, Mitsuo Iwata, Soichiro Hoshi, Yukari Tamura, Sayaka Ohara
It's a comedy and animation show, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United Kingdom.