No. They're not Japanese.
http://www.myspace.com/shimuracurves
I heard them on Last.FM. They only had about 4,000 scrobbles, then on myspace they only have less than a 1,000 adds, so I don't think this band is very big (plus it says they have no record label >.>; ) but either way, I likes 'em. I don't really know how to describe them? They're pretty neat either way. Listen to NEUfriend and Just Like Friends.