Vampires are the natural enemy of mankind. For centuries vampires have killed humans to feed on their blood, and humans have killed vampires to save their own lives in an act of self-preservation.

The old strain of vampire is a species that evolved superhuman agility and strength to prey on humans and evade capture. Their evolution was outpaced by mankind's scientific achievement, leading to their eradication.

The surviving vampires are the few who avoided direct conflict with mankind. These vampires evolved a superhuman charm to lure humans into their grasp. A charm so alluring that the human surrenders himself completely to the vampire and voluntarily allows himself to be fed on. For these humans, the vampire is no longer seen as a parasite of the human race; rather the relationship is closer to a symbiotic one.

The easiest prey for these remaining vampires are known as lolicons.