Whats III's story?

I've played FFIII <not going to say how or where cause i could get in trouble> but I havent played it a lot. I just wanna know whats the plot and story of FFIII? anyone wanna fill me in?
Thnx

[Atma-Noah]

Well the 4 boys have to save the world from darkness. In order to do that the have to release the power of the crystals. I think thats it.

[Dauragon]

This taken from my post in the CoK/OSFFC

Alright! FFIII rundown!

FFIII was the first game in the series to introduce the job system, which was probably the biggest allure this game had to me. I'll post the text at the beginning (translated version), which is the best way of not spoiling anything.

"The Gurgan quietly spoke...
This earthquake is but an
omen. The tremors that pulled
the crystals into the earth
and brought forth monsters
are nothing compared to the
Darkness that is to come...

But, hope is not yet lost.
Four souls will take up the
quest of the Light.

Four orphans have been
raised by the priest Topapa
in the remote village of Ur.

A Crystal has sunk into the
earth due to the earthquake,
and the four boys have come
in an adventurous mood.

They had only intended to
test their courage..."

So that's pretty much the background information. The game pretty much revolves around finding the crystals, and in turn, getting new jobs. The best jobs are obviously the last ones that are received (Ninja and Sage), while the first are not the best. I wouldn't say the worst, because I know that Dawezy managed to keep a Red Wiz going for a long time. There are several instances in which an airship is used as well, and the last one that's used is pretty kickass. I can't really say much else about it, other than play it. I've got an English rom myself, with no bugs in it (I haven't seen any), and perfect translation (for the most part.