This game only plays voices if it can use the Steam API to geolocate your IP to an Asian country (didn't look at the full list). Since this post uses a Steam API emulator that doesn't support changing the result of geolocation, I fixed the game to play voices everywhere.
Download https://pixeldrain.com/u/cg6TZxiS, decompress the .7z, and replace the game's GameAssembly.dll with the one you downloaded.
Could you please re-upload;
"[2010][FLAT] Utatemeguri(うたてめぐり) [Soundtrack CD + Special Song CD + Update 1.1]" ?
Quite sorry, but RG doesn't work for me.