 If you liked
Mahoromatic: Automatic Maiden
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 ...then you might like
Inukami!
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Both series feature a similar mix of ecchi humor and the occasional action-scene, and they both star a young man who has a girl living in with them. Said girl has superhuman abilities, a troubled past and a very disapproving attitude of those porn-magazine the boy keeps looking at!
So if you like either one of these series, there's a good chance the other will appeal to you as wel.