fathem: Atlus publishes the NA version of the game.
Kezardin: GOG would need to get worldwide rights. According to the Wiki (ahem) the Windows version was only released in Japan.
Well that about sums it up. I added it to the wish list, who knows maybe it will get some traction!
In general I find it frustrating games like this and tactical ogre are out of the reach of consumers who want to play it on a big screen vs a handheld. Maybe they will be willing to play ball as it is a much older title and GOG has shown they can be sold for a profit. At some point getting access to these older games becomes a catalyst for sales for the newer games.
Thanks for your response everyone!