In the center of Hallowed Heights, a towering wall divides the city. On one side of the city live the middle and upper class humans. On the other side of the wall, in the region known as the "Blood Zone," dwell the poor, the homeless, the hopeless - and the vampires. The only thing standing between the bloodsuckers and their intended prey is a young man known only as Twilight Grimm. His silver blades and blessed bullets make him the most loved-and the most feared and hated-citizen of the Blood Zone!