If your distribution came with some kind of app store, search for "bottles". After installing it, create a gaming bottle named "JPN", copy the game and the rtp installer to
~/.var/app/com.usebottles.bottles/data/bottles/bottles/JPN/drive_c/ and use the option/button "Run Executable" to install the rtp. Then, click on the bottle, go to settings>compatibility, change the language to japanese and use the option/button "Run Executable" to play.
If you encounter an error during the rtp installation, simply select the folder containing the installer files. If your distribution did not come with flatpak pre-installed/flathub enabled, follow the guide listed
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according to your specific case and then
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.