This game was never released outside of Japan, but I had put thousands of hours into it via a translated ROM (props to Neill Corlett) on an emulator, but have recently paid a handsome amount to get a translated snes cartridge. Technically it's considered to be Secret of Mana 2, and follows a millenia after the more commonly known (but still quasi-rare) game.
If you have played it, what's your favourite character/class lineup? I personally have played it many times and prefer to do the dangerous 'kamikaze' full power route with Duran (Duelist), Kevin (Death Hand usually) and either Hawk (Nightblade) or Lise (Rune Maiden?).
If you haven't played this genuine masterpiece, I HIGHLY recommend you do, there is tons of replayability with six characters to choose from to form a party of three. Each character can choose from two unique classes to change into at level 18 (light or dark), and two more choices at level 38 that varydepending on your choice at level 18 (light/light, light/dark, dark/light and dark/dark). With this amount of character customization, and three different game plots/endings/final bosses, the possibilities are nearly limitless.
TL; DR play this game.