HOST_LC_ALL=ja_JP.UTF-8 %command%
firstly do not attempt to run this with the locale emulator it will crash
so you need to add the JP locale to your steam deck
Here's how to do it
setup a SU password under the user settings in desktop mode
download and run this script https://gist.github.com/XargonWan/cc660daf92c224b7241cbf5a2bf12c47 this will automatically enable the JP locale
restart your deck
this was by far the weirdest thing the audio was muted by default
so i had to unmute it in desktop mode
the FPS would sometimes slowdown really bad
but I think FPS counter have trouble latching onto this game
since I couldn't get any FPS counter to work on Windows either
thankfully all this only needs to be done once
after that just add "HOST_LC_ALL=ja_JP.UTF-8 %command%"
to the launch option under properties
for any VN that needs the JP locale
