Red Water.

A year had passed, the city destroyed after a war had rung out amongst the humans and the monsters. The murdered had made an unsuspected turn of events, returning to become the undead. There was very few who survived, but there were two are important in this story. A girl, so innocent, so afraid, yet capable of killing who she must. And there was man, so full of secrets, dangerous, and a murderer at heart. In the end, who figured that a demon would fall for a human, all along the red water/