Once set to Proton 6. 3-8, the overall game will run perfectly with saves working. However, there is the issue with how the pre-rendered videos are playing. With no tinkering, both logo videos will work. OP video will play but stutter a lot. In game cutscene will not render and leave the test pattern.

Using the same method for various VNs with similar issues, the following can be done: -Set proton version to 6.3-8. Open game at least once before proceeding. -Using protontricks, select the game and open default wineprefix. -Select "Install a windows DLL or component" -Select lavfilters. Go through all steps and select all options and install. No other configurations are needed once install is complete. -Now enter the game folder. Go into Data folder then Movies folder. -Open terminal at this folder. Now we are going to convert all video files to something that can run easier on this version of proton. The command that will be used ffmpeg as shown below:

ffmpeg -i xxx.movie -c:v libx264 -c:a aac xxx.mkv

where xxx is the name of the file in the folder. Repeat this command until all video files are converted. -Finally, move all old .movie files to another folder. Change all files with the .mkv extension to .movie by just renaming it.

Once all steps above are completed, the game will run with almost no problems at all. I did not finish the game yet, so I didn't see if the ending cutscene will run. But all initial videos are now working.