the first japan bill containing virtual currencies is expected to come on april which recognizes bitcoin as a method of payment.Although,it doesnot define bitcoin as a legal currency,it is still considered as a remarkable progress for bitcoin in japan.Hope, most of tourists who would go to japan to see 2020 olympics would be able to pay in bitcoins.
Japan has always been among the first to accept new technologies, so it's no wonder they are willingly accepting Bitcoin now. If there was no Mt. Gox's negative impact I'm sure we'd see much more Bitcoin users in Japan today, and nevertheless they expect the number of merchants accepting bitcoin will rise to 20,000 in 2017. Right now they are about 5,000 which is not bad also.
Here's an article on this:
https://www.cryptocoinsnews.com/japan-see-20000-bitcoin-accepting-merchants-2017/