Japan has long been known for its steadfast refusal to submit to the allure of large-scale immigration, as a country that puts social cohesion and societal harmony well ahead of any desire for diversity. Notoriously as hard to get into as Switzerland or Monaco for would be migrants, and even refugees, the ‘yokoso’ (welcome) sign that greets you at Narita Airport is clearly provisional and time limited.

But is all that changing? There are signs of a major........

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