Basically what the headline says

Elisa Deraener, of Shiganshina District, is a very quiet girl, always alone, always avoided, because people thought of her as the devil, merely because of her appearance. The only people who loved and cared for her were her parents, until humanity received that grim reminder. On that day she was forced to run away from the home, and family that she loved. Enraged by what had happened, she vows to avenge her parents deaths, but will she be able to handle the torture of training? Read on to find out.