Satoshi, i think the tint percentage in japan might be backwards to that of the USA... no?
here in USA, percentage number means, "visual percent", ... meaning; at what percent can you actually see through to the other side.
30% visibility means that when outside, you can only see 30% through
0% visibility means that when you are outside, you cannot see anything - its the equivalent to going one-way-Mirror
style with your window