That's it, the title. I'm an American who goes yearly to Japan on a tourist visa, and I absolutely adore the country. I feel very at home with Japanese customs and lifestyle, and always wish I was still there when I return home. But it seems so insurmountable to immigrate to.
As far as I'm aware there is no test, they only check your employment history, tax status and criminal record?
They also go to your house to judge whether or not you have sufficiently adapted to the Japanese lifestyle.