Black (2008)

Teenage Regan fears her anger will one day destroy her. While indulging in drugs and deceit she connects to the story of Phear, a sheltered bat-winged girl who believes she's destined to become evil. As people attempt to bring Regan under control, her anger threatens to consume her. So, too, is Phear's demise when she is kidnapped and everything she knows is destroyed. As both girls attempt to reclaim her freedom, each must face her rage and learn what it truly takes to become a monster.