Long before the Toba Catastrophe, in the ancient city of Lea Monde, one young girl will see her entire world turned upside down

A man once laid to rest, Syndey Losstarot is resurrected for reasons he cannot understand. To top it all off, he has been awakened in a place he has never seen before. When the Keyblade Master Riku finds him, he cannot help but be drawn to him. Could he have played a part in his return? Or is it something else? (My first fanfic, so sorry if it's not the best.)