A mysterious gunman, Aman, is the son of a nun who breaks her covenant with God to ensure his survival. This act brings a curse upon Aman - all those that die by his gun will return. Soon, he is hunted by a gang of his undead former victims, led by the vicious Kansa. Aman enlists Fabulos, a new young warrior, to fight by his side.

When Detective Mortimer Shade is somehow killed in a freezer, a parasite called a grail possesses his body, revives him, but he needs blood to stay alive. His partner John Dark accepts the new situation and together they become vigilantes, judging and killing the bad guys, with Shade sucking their blood with his claw. However, Dark notes that Shade is losing the rest of his humanity and becoming a monster, being aware and afraid of the danger Shade represents to mankind and trying to stop him.