But there's also the fact that there it really didn't have any competition.

Dozens of movies have had their release dates delayed, or production halted completely due to the pandemic.
Films like James Bond and the Fast and Furious series have been postponed in Japan, and even local films like the Detective Conan series have been postponed.

In fact, one of the only major Hollywood films that's showing in Japanese cinemas now is the Christopher Nolan film Tenet.

https://www.bbc.com/news/world-asia-54730487