Can we please stop with the "I see lots of foreigners", "I don't see any foreigners" anecdotes!? Seriously, I expected better from HN posters. From this article we can see that there are 2.73 million foreigners in Japan:
https://www.japantimes.co.jp/news/2019/03/22/national/number...
And with a population of 126.8 million people that means that 2% of the population are foreign.