To all of those installing a Japanese Language patch - keep in mind you will run into errors since there are more English voices in this PC release than there was in the JPN PC release. While this version has all the extra features and voices from the PSP version back-ported, the JPN version does NOT have all those features.
I don't yet own this game (researching it on this and other forums before I commit) so I can't verify, but the patch creator posted on the Steam thread saying that the assets in the patch are from the PSP version
Ok, ok - there are multiple versions floating around, but I guess if you are lucky enough to find a patch like that with the PSP voices you'd probably be set. Also, I wonder if anyone is going to make a JPN language patch for all the text in the game. Mind you, I can't read the language very well, but it would be really neat to see the game at least unofficially support its original language.
If you're still waiting to buy this one, I'd say just go for it - for the 4 or so hours I've put into the PC version, I know that I'm definitely going to be playing this game and its sequel all the way through :)..... now if only this game supported game sharing between this and the PSP version....