[Nyororin]

The absolute cheapest and "painless" method? Get married to a Japanese citizen.

Unfortunately, that falls nowhere even close to the "easy" part of your request.

There is no quick and easy way to relocate to another country. Think about the effort that would be required for you to just suddenly move to a completely different city far from family/friend support in your OWN country. Not so easy, is it? Up that by at least 10 for moving to Japan.

It`s like saying "Hey, I want to be a pro athlete! Anybody know how I can be one by next month?" when you haven`t exercised in years and don`t know how to play any sports.