From before the dawn of time people (“Crimsons”) have been controlled by a deadly foe (“Clients”) who think themselves gods. Now, at the turn of the twentieth century, the Crimsons still live in fear of the Clients. Powerful individuals protect themselves by making sacrificial offerings of live human beings.Dark Hunter, Shion, is half-Crimson, half-Client – in other words a vampire. With his loyal sidekick, Rain, he wages an endless war against the Clients. When Shion meets Helen–a young girl whose family were butchered by the Clients–he makes a blood oath and takes Helen as one of his followers.

In a not-too-distant future, the Earth has been overrun by a horrifying technovirus. Mechanical parasites, mistakenly created in an attempt to advance technology, attach themselves to human spinal cords and turn their hosts into cyborgs. Desperate to rid themselves of this technological terror, the remaining human survivors must band together and learn to defend themselves against their android enemies.