For twelve years, the vampire Eugene lived a life of pathetic concealment, hiding in caves and refusing to harm humans, only to be hunted down and sacrificed for the fame of a Holy Knight. At the moment of his death, he regresses six months into the past with his memories intact. Realizing that pacifism only leads to a cold grave, Eugene embraces his nature as a Vampire Lord. He begins to systematically consume the blood of powerful monsters and enemies to unlock the sealed "Crimson Marks" on his body—ancient tattoos that restore his lost memories and god-like powers. No longer the prey, the Vampire Lord has returned to become the ultimate predator of both humans and monsters alike.