Updated: Aug 9, 2021
Currently, in Japan, 80% of the people 80 years and above are fully vaccinated. Anyone below is 14%. I am sure the country is going to push for herd vaccination soon. A majority of the people who get the virus are in their 20‘s and 30’s. As it is moving slow, a push for faster vaccinations has to happen before Japan will open its international flights freely for vaccinated people only. There was a plan to get some people in Japan by September but because of the sudden increase in cases, it has become harder to make this possibility a reality.
I suggest everyone get the vaccination as soon as possible inside and outside of Japan. Without it, you will not be able to travel freely.