Dear Sora, Riku, and Kairi
I am afraid there will be another journey you will need to make. This journey will be harder than your previous two. You will need more power, strength and wisdom. Many people have been getting keyblades recently and last time this happened, there was a great war throughout all the worlds. I am currently researching of a recently appearing monster. I'm afraid Donald and Goofy will not be able to assist you as of now, they are also helping me research this monster. Set out to Shojin City, there is trouble going on there.
That is all for now.
The King,
Mickey
Long ago, during the time of Terra, Ven, and Aqua, there was a war between the light, the dusk, and the twilight. Terra, Ven, and Aqua lead battle on the faction of light, and they fought fearlessly and never-ending. Soon, victory came upon the light. There was peace in all the worlds.
Though, the three knights had prophesied another war in the future, and this war would be bring destruction all over the universe. They searched for a person who they could transfer their spirits upon when the time came. They chose him a keyblade, the Neo-Kingdom Key, and enhanced his powers.
But... prophesies also have flaws. The full prophesy was that this chosen person would die before the battle ended. They saw this person's end. They could not change what they have done. Thus, they had to make a substitute for this person. They found, Sora. They could not pass their powers to Sora, so he had to have his own power. They could only provide him a keyblade, the Kingdom Key.
The three knights put themselves to sleep, waiting for the day their spirits will be transferred. 10 years later, Sora's story began. And the following two years, Shiro's story begins.