From Japan ministry of health website
“Consent to vaccination
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.”
Also information on site about dealing with vaccine side effects.
www.mhlw.go.jp/stf/covid-19/vaccine.html
h/t A Deplorable Neanderthal