The Japanese Wiki has a list of where the Batsu games were filmed - https://ja.wikipedia.org/wiki/%E7%AC%91%E3%81%A3%E3%81%A6%E3%81%AF%E3%81%84%E3%81%91%E3%81%AA%E3%81%84%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA
(That's a real mess of characters in that URL, but it should load)
In the case of the Hospital Batsu, it was filmed at the Hokuto campus of the Japan Aviation Academy.
The Japanese Wiki has a list of where the Batsu games were filmed - https://ja.wikipedia.org/wiki/%E7%AC%91%E3%81%A3%E3%81%A6%E3%81%AF%E3%81%84%E3%81%91%E3%81%AA%E3%81%84%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA
(That's a real mess of characters in that URL, but it should load)
In the case of the Hospital Batsu, it was filmed at the Hokuto campus of the Japan Aviation Academy.