Seven million years of human civilization are about to end… Every thousand years, all the gods of the world gather in the heavens for the Conference on the Survival of Humanity. The gods agree to put an end to humanity due to its reckless actions, but before the final verdict is made, Brunhilde, the eldest of the thirteen Valkyries, raises an objection. "To add a little suspense, why not test the humans?" She proposes that the all-powerful gods engage in one-on-one duels against the strongest champions in human history, in a final battle known as "Ragnarok." The first team to win seven of the thirteen battles will be declared the winner, but it seems nearly impossible for the humans to defeat the gods. Though the gods scoff at her proposal, Brunhilde taunts them further: "Are you backing down?" Her words wound the gods, who, enraged, accept her proposal. Now, Brunhilde and her sisters must choose humanity's thirteen champions in a desperate battle for survival. Will humans defeat the gods and prevent the end of the human race? The epic battles between heaven and earth begin!