Example of msm source that points this out:

https://time.com/6107886/japan-covid-19-case-drop/

Some links the mention Japan's use of Ivermectin and provide:

https://www.naturalnews.com/2021-08-29-tokyo-medical-association-covid-patients-ivermectin.html

https://thecovidblog.com/2021/09/01/japan-suspends-use-of-moderna-injections-after-metallic-particles-found-in-vials-country-continues-using-ivermectin-to-treat-covid-19/

https://www.redvoicemedia.com/video/2021/10/japan-covid-free-following-ivermectin-rollout/

Also, Japan's official vaccination rate is stated by the msm to be 70% which may seem high but is lower than most developed nations. In fact, there is a surprising level of skepticism of the vaccines there, especially for a country where people are known for following the rules.