Japanese laws and regulations are not restrictions on cryptocurrencies. It regulates exchanges.
The initiative of the examination when exchanges newly listed cryptocurrencies was transferred from the FSA to the
JVCEA of the self-regulatory organization.
In Japan, there is no law prohibiting the listing of Dash, and JVCEA does not prohibit the listing of Dash. JVCEA prohibits the listing of coins that may not be audited and coins that may be used for money laundering rather than bitcoin.
https://jvcea.or.jp/cms/wp-content/themes/jvcea/images/pdf/jvcea-guideline-3.pdf
Dash can be listed if the exchange that wants to list Dash persuades JCVEA and FSA.