Yeah, don't work on Linux systems, I've made some debugging and the scenes have some video renderer or texture that's not being correct passed to video thread, couldn't investigate further cause A: I'm not a Unity developer and/or B: don't want to pay to use their development tools. TL;DR Use...
Meaning if you are a smart and self-taught person get out here punk, nobody wants nerds playing this game lol. Loved the tags by the way. Good luck to the Dev.
For me I needed to run startup.exe from the mounted iso for it to work, keep in mind that I'm playing the VN on Linux. In Windows I believe that after the installation and patching, executing the startup.exe file on mounted ISO will run the game.