In the future, a nuclear explosion wipes out most of the world. The remaining humans and creatures are captured by an alien race known as Xoreans from the planet Xore that arrived on Earth, deeming the planet finally safe for themselves. They mutate the remaining animals, breeding them until they become stronger, faster, and more vicious. These mutations are used as guard creatures that wathc over the people in the cities. The guards also use the lowest ones to fight each other to prove that they are worthy of promotion. One of them, a wolf cub deemed Number 59, is a female white wolf that was mutated so she had wings. Will she be able to overthrow the Xoreans, or even survive? Or will she be killed in this kill-or-be-killed world...?