Here’s some useful information from Calton McCycle, via Kirk:

https://www.japantimes.co.jp/how-to-coronavirus-vaccinations-japan/?fbclid=IwAR2r-8EiZ-PDXCK1RxXbp3v0G1Cteb9lBuAIEFr5P1V2qgf1ProYfxMtYAc