Although we encourage all citizens to receive the COVID-19 vaccination, it is not compulsory or mandatory. Vaccination will be given only with the consent of the person to be vaccinated after the information provided. Please get vaccinated of your own decision, understanding both the effectiveness in preventing infectious diseases and the risk of side effects. No vaccination will be given without consent. Please do not force anyone in your workplace or those who around you to be vaccinated, and do not discriminate against those who have not been vaccinated. Sincerely yours, the japanese government https://www.mhlw.go.jp/stf/covid-19/vaccine.html

COVID-19 Vaccines | Ministry of Health, Labour and Welfare, Government of Japan|厚生労働省

The official Japanese government COVID-19 vaccines webpage provide how to get vaccinations, searching for vaccination sites and vaccine type in Japan.