Are Crypto and Yen regulated?

As a keen observer of the financial landscape, I'm curious to understand the regulatory frameworks surrounding cryptocurrency and the Japanese Yen. Could you elaborate on the current state of regulation for both? Specifically, I'd like to know if there are any significant differences in the regulatory oversight between the two. Additionally, are there any specific policies or guidelines that govern the use and trading of cryptocurrencies in Japan, given the Yen's prominence in the country's economy? Understanding these regulatory dynamics would help me make informed decisions in the financial market.