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There is not way to reset resolution in game but you can try editing registry.

1. In search bar type regedit.exe. That will open Registry Editor.
2. Now navigate to HKEY_CURRENT_USER/Software/LAGS/Lustful Spirit Hunt.
3. You should see some values on right side. Look for a value looking like this 'Screenmanager Resolution Height_h2627697771' and 'Screenmanager Resolution Width_h182942802'. Delete those values and close the window. Your resolution should be back to default one.