Social Cohesiveness is not also known as xenophobia.
Where foreigners tend to be so rare as to be exotic there tends not to be xenophobia. It's when the host community perceive themselves to be overrun that the xenophobia comes out.
Indeed, I say this time and again to friends and family who marvel at a lifestyle that has allowed me to live on several continents: there is no such thing as a perfect place to live.
Great for you! Then I guess you were not one of the many women who are raped for not wearing a burka, or non-Muslims who are bullied in asylum centres, or homosexuals beaten up for holding hands, or Jews attacked for wearing a kippa, or or or...
Also known as xenophobia.
>For example, I read somewhere it gets less than 100 asylum seekers a year.
And this is by definition a good thing?
Don't forget the awesome working hours and working culture! It's so good that they even have a word for the awesome overworking: Karoshi [1].
I wouldn't romanticize Japan this hard as you are doing right now, it has it's own sleuth of problems just like any other country.
[1] Karoshi (Overwork Death) https://en.wikipedia.org/wiki/Kar%C5%8Dshi