Also, plenty of people live Permanently in Japan. Citizenship is rarer, but there are plenty of long term/permanent expats throughout all of East Asia.
In reality, Japanese are incredibly racist towards the rest of us Asians, mainly Koreans due to the fact that there are so many there but also Chinese people. It is not fun. They are unapologetic for the war, snobby, and generally unpleasant people to be around.
This exact outlook towards migrants is what got 13 people killed and 50+ wounded in Berlin, and several people shot in Switzerland yesterday. These people want to destroy the West and the West refuses to acknowledge the problem.