Satan's Daughter {Blue Exorcist Fanfic}

For a girl living in the real world, she has been wondering who her real parents are. For her whole life, she has been adopted from a family with a son named Galen.
Everyday she has been bullied by a couple of girls, who she killed. But Satan had other plans made before she even got to experience being a demon for eternity.
But when she comes face to face with her actual brothers, she soon then began to see the light of the world, that she forgotten there are bad things in the world as well.