This is not, repeat NOT, in any game continuity. Like most of the games themselves, this is an independent story. You can use any character from any game that you wish, as long as you explain how they got here. Hell, they don't even have to be FF characters. As the story progresses, I'll be filing the plot in here. Check back for updates.

Here's the story thus far: Alledingesindgleichgestel, called Al for short, Zephine, Terra, and Katara, are the warriors of light, meant to destroy the Demon Chaos when he arises. They must first defeat four elemental fiends, and obtain the elemental crystals, which will push their magic to levels the world has never seen.