 If you liked
IS: Infinite Stratos
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 ...then you might like
Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken
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They're both about a male student surrounded by females. In IS the MC can do something that only girl can do, so he is therefore accepted into an academy that specializes in this amazing ability. The thing is, this school has always been exclusively for girls.
While IS is focused on a male MC developing his unique ability, Ore ga Ojousama focuses on the same concept, but the MC doesn't really have any special powers.