Actually you can lose your permanent residency if they deem that you are not following the laws. If you lose your job and don't have enough income to clear your taxes and all, they can take it away.


As for "citizenship".. it's not a word any foreigner should ever dream of in this country. You will NEVER be Japanese. I know a lawyer that stayed here 20 years, speaks completely fluent Japanese (and I mean seriously.. the guy knew more kanji than most Japanese too) and asked for his "citizenship". He even went to court with this case after being refused and guess what? The court denied it still even though he had totally great arguments.

Let's just say that unless you are Lady Gaga or Bill Gates and suddenly decide you want to be of Japanese citizenship, they won't allow it because you bring "nothing" to this country. And even then I still have doubts that either of them could get it...