Providing another log of the game running through when you swap the file names, outside of the ones mentioned, it also seems like the game seems to have a bit of trouble exiting out through the menu, so I had to do it through the steam menu for the latter times I tried testing this.
Keyboard prompt still seems to pop up and close rapidly during the intro logos and the opening fmv still hasn't been reencoded yet so it's still a bunch of test bars
mfc42.dllx1 2023-05
Compatibility Report
System Information
I confirm:
Symptoms
Tried to launch the game on deck, but it shows the spinning steam logo for a few seconds before silently exiting out to the game page (Checking the log and the protondb page, apparently this error might be the cause).
err:module:import_dll Library MFC42.DLL (which is needed by L"E:\steamapps\common\Yatagarasu\YatagarasuLauncher.exe") not found
You can get the game to launch on deck by swapping the names of "YatagarasuLauncher.exe" and "game.exe" to skip the launcher and the game seems to work alright-ish, but it seems like it has some weird quirks still, like rapidly trying to bring up the virtual keyboard until you get to the title screen or the game intro playing the color bars instead. (I checked inside the game folder and guessing the problem for the intro is the op.wmv file)
steam-319280.log
Reproduction
Try and launch the game.