Which is to say, none at all. There's a vampire and a monster and a girl who's a monster and a bunch of Prinnies and they almost kiss and then the world blows up in a church and there's a -- oh, forget it. Just go watch it after the break.
In the beginning, man feared the darkness. Vampires, werewolves, zombies, ghosts, etc. Darkness differed by nation, but its powers were feared alike. However, as civilizations developed, people began to fear man itself, like war, murder, terrorism. This story begins at the prison of the netherworld. A story about the one who will change the world.