[jack10110]

You could also create your own company in Japan (no visa required or lawyer, just ward office fees ranging from $400-800 for a kabushiki "publicly traded company" or godo gaisya "LLC") If you rent an apartment, you can make that your HQ and the government will accept it. Question is how will you make money! Areas such as Saitama will actually subsidize your company up to a certain percent if they like your business plan. Oh and investor visas don't exist anymore. So although you have your company, you need a Japanese person to sponsor you. Anyway I doubt you would go this route. But...now and again some do!

...and Japanese government is a greedy one. Depending on your tax bracket, nearly half of your revenue goes back to the government. So if you make 1 million dollars, they will take nearly half of it.