Japanese Covid Cases surged after the Tokyo Olympics.
https://halturnerradioshow.com/index.php/en/news-page/world/breaking-news-chairman-of-tokyo-medical-association-tells-doctors-to-prescribe-ivermectin-for-covid-treatment

In the third week of August the Chairman of the Tokyo Medical Association recommended doctors to prescribe Ivermectin to covid patients.

Immediately you can see the graph dropped to very few new cases within a month.