I think it's better to stay out of government related crypto, the idea of crypto is to be free from these institutions, not the other way around. If you want to invest in a japanese coin, try MonaCoin instead, pretty solid
Yeah, some people just see cryptocurrency and are ready to buy, it is similar to the dot com bubble where people only needed to throw some buzz words and everyone was ready to invest million of dollars, also one of the worst countries when it comes to managing its currency is Japan, that is why it is one of the most indebted countries in the entire world and that is not going to change anytime soon.