Heir to the Kingdom

We all know that before there were multiple Worlds, there was One. And most if not all of the Worlds that we know of today are already about as big as our World. And if all of the stars in the sky are Worlds, how huge was the Original? This is THE story about 3 siblings that were involved with the Original Keyblade War. Two on opposing sides and one wishing to help them see the error of their ways. Only to be exposed to the raw and ultimately unrefined power of Kingdom Hearts.