A player reported a bug to me, for which I released a small fix.

The bug concerns a rare situation, namely where Bianca fails to rescue one of the heroines, then goes on a mission with a heroine that she did rescue, and then goes on the mission of the heroine that she failed to rescue. In that case, the heroine that is still imprisoned will suddenly be at the mission anyway (and afterward will be imprisoned again, at least, if she survives the mission). You also may see a Ren'Py bug, which you can ignore. The bugfix is done in the witch's hut where you meet the heroines before a mission, so if you are in this situation you should either reload the mission from that point, or just continue playing (it should not affect anything beyond the mission).

The error was caused by me failing to set one flag correctly in this particular situation. This is a complex game and it is pretty much impossible to test each and every situation that may happen. So, if you encounter a problem or bug, please let me know (e.g., in the comments on the game's page). As I say in the FAQ that you find in the Extras menu in the game:

"Due to the high complexity of this game, I expect that there will be bugs that I did not discover during my extensive debugging. If you found a bug, and are willing to report it to me, please send me an email at scarlet_herring@yahoo.com. Include the version number of the game, and as much information as you can so that I can trace it. If it is a Ren'Py error, you usually get to see a specification of the error, including a file name and a line number. Either report those, or make a screenshot. What is also informative is the last screen that did not have the bug yet (using Rollback you can get to that screen). If you are not using the latest version of the game, you may also install that one, re-load a save, and see if the bug is still in there. It may have been solved already."