Delta virus is spreading in USA and England. China also has progressing numbers of Delta virus. In Japan, the 4th spreading of Covid-19 is because of this Delta virus.
Delta virus is very difficult to suppress. You are not free from Delta virus even if you are vaccinated. Olympic game will be held between multi-countries with different vaccination level.
Your country is far more progressing in vaccination but not suppressing Covid-19. How do you like to visit Japan with less vaccination and in progress of Delta virus Covid-19.