Basic plot outline
Humans have made deals with demons, thus turning their blood black and becoming possessed by varies demons. A group of humans who have been intrusted with the ability to fight demons must destroy the possessed humans and close the gates to hell before the earth is overrun, of course human emotions can always get in the way of a job, affection be the main.
Will the group of humans be able to stop the black blood humans before time runs out and the gates of hell remain open? Or will this be the end of earth and the beginning of the new world?
