(Prologue: A Brief History of the World as we don't know it and the Shadow Guard)
Over 2000 years ago a meteor crashed into earth destroying the entire civilization of Atlantis. The meteor was created from pieces of Vanguard when it imploded because of the heartless. The heartless traveled through space on the piece of the planet. But because of the speed and lack of oxygen most of the heartless died going through space. When the meteor crashed into earth it not only destroyed Atlantis but it created a rift in time and space and it formed two other copies of earth. One of the copies seemed darker and more evil than the other two and the other one was smaller than the others, about the size of the moon. Humanoid aliens followed the meteor to try and stop the heartless from destroying other planets. When they landed they decided to study the heartless instead of killing them. They sealed the planets off from each other using three mystical keyblades; Fenifer, Oblivion, and the fabled Twilight Blade. Each part of the planet was named after the keyblade used to seal it off from the other. The three people who were trusted to seal the worlds and the keyblades (so that no one can use the keyblade for evil) were Sora, Riku, Karie. They used a seal that only their ancestors would be able to break. Afterward they created an organization to protect the citizens of Fenifer and study the heartless. They named it The Shadow Guard. Fast foreword to today, the heartless are too powerful for the Shadow Guard to stop them, and they are forced to call upon the ancestors of Sora, Riku, and Karie and reawaken their powers to help stop the heartless force threatening to envelop our world on darkness and destroy the world as we know it.