MF文庫：精霊使いの剣舞
著者：志瑞祐
イラスト：桜はんぺん
Seirei Tsukai no Blade Dance (精霊使いの剣舞) is a light novel series written by Shimizu Yuu. The illustrations are done by Sakura Hanpen. Currently, the series has 4 volumes.
Title may be translated also as "the spirit charmer's blade dance", but it might be too literal. 
Story Synopsis (copied from Baka tsuki)
Only a pure maiden can have a privilege to contract with spirit. In here, Areishia spirit acadamy, trained maiden in the noble family were gathered, and gave them an elite education to become a spirit contractor. A boy Kamito, by an accident he peeped into a girl, Clair taking a bath, and he even made a contract with spirit that she wanted. Yes, Kamio was an irregular boy spirit contractor that is impossible to exist. "You stole...my spirit...you have to take a responsibility for it!" "Huh?" "You have to become my contracted spirit" What will Kamio's destiny leads to? (From FairGame)
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Good series. It feels a bit like Zero's tsukaima. While the setting might be a bit generic, the series boasts a master blend of fantasy action together with harem fan service. The male character comes with a mystic past: beside the happy harem-forming magic school life, plots are revealed and he is force to take actions and confront both his past and new enemies.