No they didn't. They did live in Japan, constantly had songs about anime, and one of them was in Melt Banana, which is where I got confused.
They're still better than all the other bands in this thread though.
Quoted for trueness and the mention of Melt Banana.
I also heard somewhere that one of the members of Merzbow was Japanese or something...

Seriously now, I don't want to troll here, but this topic is somewhat unnecessary. Having someone from Japan in your band does not in fact influence your sound or make your band any better, I'm sorry guys.
Otherwise, I might feel obliged to start threads like "3 OR 4 GUYS FROM CANADA, USA OR THE UK IN A BAND = AWESOMENESS AMIRITELOLZ?" and throw tons of bands that fit into this category at you and that I consider awesome.