That graph would be more impressive if it actually showed when Ivermectin started being used extensively.
There is just a comment that the Japanese AMA made an announcement that ivermectin is useful, and they recommend its use. It doesn’t actually state that they are using it in Japan, and if so - on a wide scale level. And why are the plots different between Tokyo and Osaka?
I think it was August 13th when they reported the effectives of IVM and then held a press conference on Aug 22 about it. So it’s only been a few weeks. Watch that line continue to head straight down like every other country that uses it.