i read an article that they opened their bitcoin exchange platform and was greeted with an overwhelming demand.
here is the link:
https://bravenewcoin.com/news/japans-largest-forex-market-opens-bitcoin-exchanges-to-overwhelming-demand/
although i have visited the website and sadly it is fully in Japanese and doesn't have English version.
but with a lot of working around this problem i managed to use google translate and sign up and go around a bit. it seems like a good platform but i could not find anything on their daily volume.
so if anybody has any information on their Vol it would be great if they could share it.