Does the game folder look like that? That is the demo, but I guess those 【01】ReadMe.txt, 【02】素材提供者様について.txt ... are shipped with the full version too.
View attachment 955597
I'm asking it because the file names are encoded as
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. Maybe your extraction software didn't handle them correctly. See also
TheBlueKnight's suggestion. That or WinRar and CTRL+E to select the right language.