Don't need to install anything just extract `chuchu.mdf` with 7zip or winrar and launch `chuchu.exe` to play the game.
Tested and confirmed everything is working fine on my Windows 11 pro 64 bit Japanese with the lastest update.
`Save game locate at .......\Documents\SOFTPAL\ユニゾンシフト\Chu×Chuアイドる`
![alt text](/ "(UNiSONSHIFT) Chu×Chuアイドる")
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AkaneHaruka (uploader)