In the far future, after civilization has been ruined by Armageddon, the human race is embroiled in war against the vampires. An international organization, the Chancery (Vatican) in Rome, dispatches expeditionary executors to protect people from vampires. One such executor is Abel Nightroad. Though he looks powerless, he is actually a vampire who sucks other vampires' blood. During the battle in which the existence of humans and vampires hung in the balance, Abel meets a girl named Ester. This encounter changes her fate drastically.