Many many years ago these good guys named the Light Warriors defeated the ultimate evil. However, in the present day, things are looking bad again, with malicious monsters lurking throughout. Prophecy was foretold that a new set of Light Warriors, holding four darkened orbs, would return and save the world from peril. And, of course, you control that party of Light Warriors. Instead of starting with a predetermined party, you can choose four characters out of six possible classes.
Fighters are obviously the best at physically hacking opponents to bits.
Thiefs are decent fighters, but are also very agile and can run away very easily. Black Belts are also great fighters who do well without weapons. White Mages cast white magic, Black Mages cast black mages, and Red Mages can cast a little bit of both. Yes, there are two types of magic. White magic is primiarly for healing and defensive needs, but there is an attack spell known as Harm that will decimate undead opponenets.