I had the same problem with the "5mg" video, the text was not showing up.
I thought it was because I'm Japanese and I'm using a Japanese "windows OS", so I tried to find something font related, but it didn't work.
However, when I open the options and select where the "Language" is, the text is now visible, so I am happy to report! (”Language” is the same as in the video by "ezez_game" (1:04~), but without the flag.)
Anyway, the demo version of Wife Quest "妻クエスト" was great fun!
I love how expressive MIA is <3 I'm rooting for you :)))