You see them in parks... they are big and look vicious, and they wear a black and yellow wasp suit - adding to the concern - but I have no idea if they're actually dangerous... Tokyo Tower in the background...

After some research I think it's a Nephila Clavata. Its bite is not lethal apparently, just leads to some blistering and local discomfort for about 24 hours. But don't take my word for it, I'm no spider expert, and I'm still unsure if I have the right one...

Leica M9 with Leica Summilux 50mm f/1.4

Tokyo, Japan - 9 October 2014