Demons have infested Earth and only one warrior stands between the dark and the light: Saya, a half-human, half-vampire samurai who preys on those who feast on human blood. Joining forces with the shadowy society known as the Council, Saya is dispatched to an American military base, where an intense series of swordfights leads her to the deadliest vampire of all. After 400 years, Saya's greatest hunt is about to begin.

Demons have infested Earth and only one warrior stands between the dark and the light: Saya, a half-human, half-vampire samurai who preys on those who feast on human blood. Joining forces with the shadowy society known as the Council, Saya is dispatched to an American military base, where an intense series of swordfights leads her to the deadliest vampire of all. And now after 400 years, Saya's greatest hunt is about to begin.

At Yokota Base in Japan, American soldiers stand guard at the brink of the Vietnam War. Although they fear the enemy outside their base, an even more dangerous enemy waits within - bloodthirsty vampires walk among them. Saya, a fierce and beautiful vampire hunter, is sent to lead a team of undercover agents whose mission is to decide who is human and who is not, and wipe out the vampires before they can wipe out the base.