Ignoring the obviously drunken version of myself
Here are some more techno bands from Japan that are Japanese. I promise.
Buffalo Daughter (whose names sounds wierd even to me)
Hadaka no Rallizes (or Les Rallies Denude, as some prople call them)
Out of those two, Buffalo Daughter is probably most popular simply because they've been around longer and because people just like them. And they're better too. They're like veterans of techno over in Japan.