Wow, nice timing on the thread, considering I just picked this up a couple of days ago myself. The game is pretty unforgiving, especially when your japanese is as bad as mine. The old Game Over thread had some info which helped alot, but for example, I didn't realize what was wrong with some of my characters when they started the game with what appeared to be a status effect with no cure (turns out their clothes were torn up, and needed replacing).
Currently I just made it past the nearby forest level and onto the cave and got some good loot and exp from there, only to be bushwhacked on my way out by a sea serpent that somehow came out of the water after hitting it a few times.
Btw, has anyone figured out why charging attacks doesn't seem to work properly? A lot of the time it fires prematurely and at random intervals, making it very difficult to hit things with it. It seems to be worse in crowded areas (in fact the whole game seems to freeze up briefly whenever an enemy is knocked backwards).