Tokyo's Olympic and Paralympic Games set to begin in late July 2021 without spectators from abroad, but vaccine rollout has been slow in Japan compared to other developed countries . In this study, COVID-19 epidemic curve in Tokyo is developed based on weekly reported data from January 23 , 2020 until April 16 , 2021 . The maximum daily number of the infected cases in Tokyo in August 2021 would be 7,991 if the current pace of vaccinations (1/1,000 per day). This daily number is greater than the highest daily cases (2,447) recorded on January 7 , 2021 . However, if the rollout pace could be doubled (1/500 per day), the peak daily new cases would be 4,470 in August . If it could be quadrupled (1/250 per day), the peak would be noted at 2,128 in July and the highest number in August would be 1,977 . If vaccine rollout could not be enhanced, the cancellation might be an acceptable decision, since health is the most precious to our Olympians.