Which for whatever reason seems to be standard with a lot of Japanese games, is a super hard final boss. Maybe I just suck, and am not a skilled gamer...whatever. But I played through the entire campaign with little or no resistance, and then the final boss was just way too hard for me. Not to mention you can never just fight the final boss and defeat him, he has to have like 3 different forms that you beat.
Eventually I just leveled up for an hour, and put the game on EASY MODE to beat it. I ended up beating the final boss on my first try after that, but it was still a somewhat long and drawn out fight that I just couldn't have seen myself beating on the regular difficulty level. Point is its just annoying how they ramp it up just for the final boss, as if the only way to have a satisfying ending is to make sure it's really hard to accomplish.