Yes, Japan is one of the few countries in Asia that have government supervision over foreign exchange retail transactions. There are some Japanese distributors, but the mainstream distributors in Chinese mainland do not provide related services. As for whether China investors can open accounts in these dealers, I believe the dealers will not object. As for the specific large-scale business in China, Japanese dealers have some, but they have no time and energy to conduct specific investigations.
At present, the mainland foreign exchange retail market has been occupied by dealers such as the United States, Britain and Australia. (But in fact, there are not many fully qualified licenses. )