Shadows of the Soul

Naigasa, a orphan part of experiments on kids with powers. One day those experiments opened up a rift to a demon world breaking the orphan family up. Years after the ordeal, Naigaisa ,who was adopted, never wanted to come to terms with her past and never wanted to use her ability to use her shadow. But now she is forced to use it to fight the demons to keep them from taking over the world.