I was fiddling with the "Game Hub" app on my AU SGS2 today (I don't normally go in there because.. why bother), hit the G-gee area and noticed Disgaea Netherworld Unbound sitting there.
I immediately downloaded it, but upon launching it I get "Failed to launch application. The application may not be compatible with your device", which makes you wonder why it'd be there in the first place. The more I think about it though, the more I think it's a regional thing.
So, if anyone in another country with an SGS2 or Kyocera Echo or "official G-gee supported device" wants to give it a whirl and see if they can get it to run (and then maybe tell us your build.prop bits?), you can get it here: http://ggee.com/gamehub/app_705.html