 If you liked
Seiken Tsukai no World Break
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 ...then you might like
Kuusen Madoushi Kouhosei no Kyoukan
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In both mangas, a special guy comes to an academy, where they train to defeat beings that threaten mankind. The guy is someone who possesses more power then a normal person would, and has some sort of shrouded past that has yet to be discovered. Females surround both men, but in Kuusen Madoushi they do not appear to have feelings for him. Both mangas are also based off of light novels.
If you've read one manga and enjoyed it, you may like the other.