Tokyo just like Seoul has seen a recent increase in COVID infections and this has caused the Japanese government to cancel fans attending the games:

Organizers of the Tokyo 2020 Olympics on Thursday agreed to hold the Games without spectators, after Japan declared a coronavirus state of emergency for the capital that will run throughout the event.
The widely expected move was made following talks between the government, Tokyo organizers and Olympic and Paralympic representatives.
It was “regrettable” that the Games were going to be held in a limited format, Tokyo 2020 President Seiko Hashimoto told a briefing, adding her apologies to those who had bought tickets.
Korea Times
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