From quick googling I see steam_api.dll is used for running pirated Steam games (bypassing the connection with the client or something) so that seems unrelated. Shelter isn't even on Steam. Either way, this seems like a problem very specific to your device and it's unlikely anyone will be able to help you here. If you need more help, you're welcome to join the discord server.
Viewing post in Shelter (Furry Visual Novel) comments
I found out what the problem was, and I found a funny solution in the ahaha steam community... The problem really turned out to be very rare in that it occurred to a small number of people, the solution turned out to be as simple as possible: Language and Time settings(Windows 11)/Language Settings(Windows 10) --> Administrative language Settings --> Advanced --> Language of programs that do not support Unicode --> Change the system language --> check the box "Beta version: Use Unicode (UTF-8) to support the language worldwide. After these actions, all the novels began to work as they should.