Beated this game with help of google translate + walkthrough from japanese site, game is pretty nice.
One thing tho the game sometimes freezes and bugs out, it then resets the map data or something and you just lost all your quick travel/checkpoint progress. I am stuck in the final boss area because of this (can't quick travel out and the final boss area is closed off from the rest of the map until you defeat a certain boss I think) and gotta start a new run if I want to explore the rest of the map lol. So yeah, if your game freezes, go to your checkpoint and make sure your quick travel option isn't reset before saving.