Onegai Teacher
1 parts
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. (Source: ANN)
Parts, ranked
Every entry of this series by aggregate score — the sub-ranking inside the ranking.