Five hundred years ago, a great cataclysm shattered the world into six fragments. Today, humanity survives on only three of these worlds, firmly believing that the other three were swallowed by the abyss and lost forever.
But the truth can no longer be hidden. With only ten years left before another fragment collapses, the continents must be reunited. To save what remains, a young man named Zero must find the ancient gates and unlock them using the Sonic Keys—the sacred words of a long-forgotten language."