Please note this story is written from a limited bases. I only have one manga and a few of the games. So I will only say this once, please do not bitch and complain about it. If I was able to get a better source of information then I will. Also this story is like what happened in Kingdom Hearts Dream Drop Distance. So please don't bite my head off.

Kingdom Hearts: the Final Battle
By Sheniqua Tiluna
Prologue

After the battle with Xemnas, Sora and Riku were called back to Master Yen Sid's tower to take the mark of mastery exam. That is where they met Suzu, a young girl who was their very best friend that left for a few years.
They listened intently as Master Yen Sid explained what they had to do. However, as he continued to explain Suzu felt a fear set over her as she realized that one of the sleeping worlds they may go to was her old home.
She kept her mouth shut as they were sent back to the Destiny Islands before they were swallowed by darkness. This is where our story begins. Before darkness took the home of our hero's and before the journey that would change all their lives would happen.