From the introduction: A hundred beasts roar with Gaoranger. Gale force shinobi, Hurricanger. Explosive dino-guts with Abaranger. One thousand years ago, a war was waged between humans and the demonic Oni Tribe Org. With the aid of the Power Animals, the ancient Gao Warriors were able to defeat the Org’s leader, Hyakkimaru, and seal the Orgs away. The Orgs, born of the sadness and madness of humanity, have begun to return in the modern day of 2001. To combat them the Gao Priestess Tetomu and the Power Animals have selected five modern humans to take up the mantle of Gao Warrior, but to do so they must abandon their previous lives. They five come together as Hundred-Beast Squadron Gaoranger.