Vampire Raid

Teenage boy, Leo Smith, finds himself waking up in a laboratory with a beautiful scientist named Allison, but the only thing he knows is his name. In the lab, Allison explains to Leo that he is a vampire. He doesn't believe it at first but when Allison sets him out to the real world, Leo finds himself preying on humans and slaying other vampires that want his blood. He doesn't know why, but he can find that out at the Imperial Kingdom of Vampires, where is answers await him.