There was a recent hacked on a Japanese trading platform Coincheck:
https://www.japantimes.co.jp/news/2018/01/27/national/cryptocurrency-exchange-coincheck-loses-58-billion-hacking-attack/#.WmxyHXaWbIU
So I'm not sure if this will affect how Japanese government will see bitcoin or crypto for that matter. Although it was NEM, but still it is a major heist since the hackers took off with $500 millions. It's too early to say, but let's see how the Japanese government will deal with the recent attack. I hope that they will remain as the leader and not fall to the pressure of other nations like Germany and France or even China to put up a strict regulations around cryptos.