Seirei Tsukai no Blade Dance

Only a pure girl may enter into a spirit contract. At Areishia Spirit Academy, the daughters of nobility are assembled to take elite classes and become spirit elementalists. A boy named Kamito happened to be peeping on a student named Claire while she was taking a bath, and he accidentally makes a contract with a spirit instead of Claire. Now, Kamito has become something once thought impossible in this world — a male spirit elementalist.