Ami isn't human. She's a being created for the purpose of protecting humans from vampires, but her father is a vampire. She loves the very creatures she's meant to destroy. However, there are others who do not feel the same about the creatures of the night. Ami finds herself in danger after the leader of an organization called "The Slayers" discovers her and wants to use her to fulfill his goal of killing The Vampire King, along with the entire vampire race.