Emo vampire assassin love story

Scarlet and sky were 12 when their parents were murderd infront of them by vampires after that they vowed that would only live to kill vampires but when scarlet n her sister get a mission to go to highschool and kill two vampire's she slowly begins to fall heed over heel's for a vampire named Alex but will she do what she told to kill him or runaway with him so they could be together