Are there many black people in Japan?
I did not see very many black people in Japan when we traveled there. I imagine like other minorities (all other ethnicities, other than Japanese, actually), people may look at you a bit more for being naturally different in appearance. Japan is such a homogeneous country that anyone not Japanese stands out in a crowd. I think that the atmosphere is friendly. And, any attempts at speaking Japanese will be considered very respectful and they will enjoy working with your phrasing to communicate with you. Have a great trip and give them a smile and a slight bow if they look at you longer than you are comfortable with. The food is really really good — try everything!