NMWA Aequalis  Suggested by akira1975 

According to the property of this pdf, the typeface is NMWA.
https://www.nmwa.go.jp/jp/exhibitions/pdf/2023revisiting.pdf

I don’t know who designed it.

TO: akira1975
Thank you for your suggestion and research!
Its interesting that there is no information about this typeface on the internet

Oops, the name of the designer appears in the pdf.

“Typeset in NMWA Aequalis by Kazuhiro Yamada (nipponia)”
https://www.nmwa.go.jp/jp/exhibitions/pdf/2023revisiting.pdf

Nipponia:
https://nipponia.in/

I asked him and he confirmed it. He designed the custom typeface.

To: akira1975
wow...THANKS! Wonderful actions and connections!