 If you liked
Zero no Tsukaima
|
 ...then you might like
Ore no Imouto ga Konnani Kawaii Wake ga Nai
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While the setting is completely different the dynamic between the two main characters is quite the same (girl hostile, treating the boy as a slave, boy acting kind, caring and protective for the people around them, even though being annoyed by getting treated like that).
Also the development of their relationship and the relationships around them shows a lot of similarities (recognizing the true feelings towards each other, making friends together, watching out for each other and so on). The people they make friends with are different and not comparable, though.
It feels quite the same when watching these two animes.