Re: The Demon's Kingdom ~亡国の女達~
Well as it says you are missing a font, so either you have an incomplete version of the game, or when you unzipped it you were not in Japanese locale.
What files are in the Fonts folder of your game installation? If any have a garbage filename (not English or Japanese) then it is the locale issue, you will have to re-unzip the folder after changing your locale for non-Unicode programs
My Fonts folder for the game contains
sazanami-mincho.ttf
umeplus-gothic.ttf
umeplus-license.txt
衡山毛筆フォント.ttf