 If you liked
DearS
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 ...then you might like
Mahoromatic: Automatic Maiden
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Same type of story. Both are about alien girls. Both have a main character that's a guy and they both fall in love with the alien girl.
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Recommended by DeathfireD
They both show a boy living with a non-human girl. They also have a perverted female teacher who likes to get in the way.
The perverted, intrusive female teacher , the maid/servant and overall mood is very similar. One has a aliens, the other has a robot, but both are unfamiliar with normal humans and idealize their master. The two shows belong to the sudden girlfriend genre, only with slight differences.