Turns out EA in particular has some kind of particular dislike for marketing/selling games in Japan. In turn, it is particularly difficult to buy digital copies of games like Mass Effect, which are easily available via Steam in the States but hidden/blocked to consumers in Japan.
HOWEVER. I have found a loophole that is quite hilarious to me - the internet on-base here ends up being read as from the United States, possibly because it's an American military base and whatnot. So...I can get on a computer using internet on-base, buy the games I want, and download them at my apartment less than a mile away where my internet is Japanese. Suck it region blocks, I'm getting my games no matter what you try to do to stop me.
Besides, I could've had a family member in the States buy the game on my Steam account and still downloaded it here if I really got desperate. Still, funny loophole.
I kindof want to make a Success Kid for this...