I'm not really the biggest metal fan, but I did see that someone was looking for Japanese metal bands in this thread so I thought I would recommend
Boris. I'm not sure if everybody would consider them metal, but I think some people in this thread might like them. Here are some links to some youtube video's by them so you can see what they are like.
Korosu
Ibitsu
Death Valley(live)
A Bao a Qu
I hope somebody likes them!