Demons

Scarlett Hartley had watched her parents be shot by her brother. After this she swears that she will get avenge her parents death with the death of her brother. The task turns out to be a lot harder than she had originally thought because she hasn't seen her brother in 11 years. So one night when a mysterious crow comes to her in her dreams and asks her what she wishes for she says to kill her brother. The crow then turns out to be a demon who makes a deal with her stating that he will help her achieve her wish, but when her brother is killed, she must allow him to eat her soul. With nothing but hatred and revenge on her mind she agrees. And gets marked with the demons seal on her left eye.