The only companies credited on-screen as producing the film are American Zoetrope (US) and Elemental Films (UK). The full company credits are "Focus Features presents, in association with Tohokushinsa, an American Zoetrope / Elemental Films production."

Tohokushinsa (JP) and Focus Features (US) are the US and Japanese distributor, respectively, of the film.

You're flat out wrong for this, it was filmed entirely in Japan and predominantly with a Japanese production team. It's a japanese co-prod, you can dent it all you want, but it is. This is the only website listing it not as such. Completely false preservation.

@thegr1fter said:

You're flat out wrong for this, it was filmed entirely in Japan and predominantly with a Japanese production team. It's a japanese co-prod, you can dent it all you want, but it is. This is the only website listing it not as such. Completely false preservation.

Where the movie was filmed has absolutely nothing to do with the production countries field. That field is for the countries associated with the production companies. From the Contribution Bible:

The production countries field should be used to list the producing countries. They are the countries associated with the movie's production companies. (https://www.themoviedb.org/bible/movie/59f3b16d9251414f20000008)

For example, Superman & Lois is filmed entirely in Canada but it's a sole US production as the production companies credited (Warner Bros. TV, DC Entertainment, and Berlanto Productions) are based in the US.