Since the issue is storage-based, a permission reset often works:
A free alternative designed for playing Kirikiri2 engine games on Android devices. VNDS Interpreter: Suitable for older visual novel formats. kirikiroid2 license fail
If you have multiple Google accounts logged into one device, Android can get confused about which account owns the license. Uninstall Kirikiroid2 from your phone. Since the issue is storage-based, a permission reset