Installation:
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Drop the entire "scenario" folder (not just the contents of the folder) into your "Steam\steamapps\common\Kindred Spirits on the Roof\game" directory.
The patch has only been tested on full chorus, but I've edited both the _fc and non-_fc versions of the scenario files, so it should theoretically work on both.

Specifics of the changes made are listed in the changelog text file. If this is your first time playing the game, do note that the changelog obviously contains some minor spoilers to the events that are changed.