Senjou no Waltz

Senjou no Waltz tells the story of village girl Ran, who obtained massive power from a cursed magic sword after losing her parents and hometown. She ended up at an ultranationalistic military school known as Nirvana. It was a unique school, a country in its own right gathering boys and girls that excelled in combat.

One day, a girl suddenly had everything stolen from her. Her hometown, her parents... and in exchange she obtained "power".