All areas designated as refusal to land in Japan have been lifted.

Until now, due to the spread of the new coronavirus infection, some countries and regions were subject to denial of landing in Japan, but as of 0:00 a.m. on September 4, 2020 (Japan time) , have all been cancelled.
However, measures will continue to require foreign nationals wishing to enter Japan to obtain a visa before entering Japan (except for re-entry).

For details, please see the website of the Immigration Services Agency of Japan below.
https://www.moj.go.jp/isa/hisho06_00099.html