Miyu is a mysterious girl who was given the duty to hunt down demons known as Shinma, and send them back to the darkness from which they came. Miyu herself is half Shinma and Vampire. But all that matters is that she is the Guardian. With help from the friendly Shinma Shiiina, and the Western Shinma Larva, Miyu faces a battle that the human race doesn\'t know about. While trying to infiltrate society, Miyu befriends some girls who help develop Miyu\'s emotions.
