What kind of business can a foreign national conduct in Japan if they have been issued a “business manager” visa?
There are no special limitations as long as it is considered a legitimate business in Japan.★ Explanation ★
As long as it is considered a legitimate industry in Japan, there are no limitations imposed on a foreign national with a business manager visa when it comes to establishing their business. However, they will still need to obtain the necessary government licenses to operate their business in Japan.