I don't know about now but during my visit I only saw like 2 black guys. Though in akiba and other touristy spots like kyoto there are a shit ton of chinese people. Speaking of chinese, when I first went inside their subway stations I was surprised to see korean, chinese, and english signs. When you board their trains their announcements were also in those languages. Overall it was a very clean and orderly place. People praise the food but I thought it was okay although a bit expensive. If you visit the more rural parts it gets really dark at night.