The real reason: Chinese tourists buying anything that is "popular" and "good", go to any places in Japan and it's overran and ruined by them.
Lot's of articles on that (google chinese tourist hibiki, plenty of results, including ft.com articles)
> Within hours of Heinrich Hiesinger stepping down as ThyssenKrupp AG chief executive last week amid pressure from activist investors, the talk turned to “locusts,” Germany’s catch-all term for the evils of Anglo-Saxon capitalism.
[1] https://www.bloomberg.com/view/articles/2018-07-10/hedge-fun...