Wait, you're playing them in Japanese? Then skip all that sub-standard shit and play Eternia psp. Also I think Rebirth got a psp port, the combat in that is leagues better than these R games.
Fwiw, Eternia will feel kind of old dated like a 16-bit rpg, but it still plays fine and has a good cast and world. Rebirth plays very modern and deep but the story/characters are so bad.