Polygon has a long industry-focussed article on Call of Cthulhu in the Far East, in nations such as Korea and Japan…

20% of Call of Cthulhu users play in a language other than English. That’s double the rate of other systems.

There’s also a thriving indie sub-culture…

You go to any game store [in Japan] that carries RPGs and there’s the Call of Cthulhu book, always in the top five weekly, monthly sales. No matter how many years have passed, it’s always there. And you turn to the right and there are three shelves of Cthulhu supplements written by people where not a single penny goes to them or Chaosium.”