The grand start of the Olympic Torch Relay 2020 marks the commencement of the Olympic flame’s journey across all the 47 prefectures of Japan before the flame arrives back in Tokyo for the opening of the games on July 23, 2021.
source https://www.jagranjosh.com/current-affairs/ioc-congratulates-tokyo-2020-on-start-of-olympic-torch-relay-in-japan-1616681464-1