Japan relied on near universal masking (voluntary too, no mandate) and high vaccine take up. Current approved pharmaceuticals are remdesivir etc. refer:

https://www.pmda.go.jp/english/about-pmda/0002.html

If you imply ivermectin has some part in japans strategy, I encourage you to read this:

https://www.forbes.com/sites/brucelee/2021/11/27/no-ivermect...