


PROTON_NO_ESYNC=1 %command%
By default, the dialogue and the background music are not available.
Can launch and play the game right after installation. Just that the dialogue and the background music are not available. After installing xact using Proton tricks, the game will behave normally with all the sounds. The steps are as follow, thanks @Jawmuncher
- Install the game.
- Go to desktop mode and search for "ProtonTricks" in the Discover App. Install and launch it.
- It may prompt you to execute a command if you have a SD card inserted. Execute the command and restart it. This will give ProtonTricks permission to read / write to the card.
- Select the game name from the list, in this case, "The Quintessential Quintuplets - Five Memories Spent With You".
- Select the default Wine prefix.
- Select "install a windows DLL or component"
- Find XACT (not the 64 bit) and install it.
- Go back to game mode.
- (Optional) Set the launch options "PROTON_NO_ESYNC=1 %command%", not really needed I think.
- Enjoy the game.

GST_PLUGIN_FEATURE_RANK=protonaudioconverterbin:NONE WINEDLLOVERRIDES="XAudio2_9.dll=n,b" %command%
Install xact through wintricks:
WINEPREFIX="YOUR_STEAM_LIBRARY_LOCATION/SteamLibrary/steamapps/compatdata/2507620/pfx" winetricks xact
Without tinker steps game launches and works fine, but there will be BGM and voicelines missing
First install xact via winetricks. Then add the xaudio 2.9 dll as outlined in a Steam discusison post for a similar game here. After that relaunch and voice lines will work!

Voice lines are completely missing
Tried the XAudio2_9.dll fix as well (both 32bit and 64bit version) but didn't fix audio issues