Nope, no one should ever depend on one save file. Unfortunately, no you cannot revert per-se. Game is not only governed by switches and variables as so many believe. However, if the goal is NOT to replay Mike party but to just set the already completed mike party save to another path, then this is possible. Might be better for you to just search for a mike party save, change the name to yours and continue playing. Reason I say this is, changing and setting on another path may be to much hassle, as there would be many things to change.
Thanks I just grinded the fuck out of it again lol, thank goodness it wasn't that much
I do have to ask on shirley and daisy, I already got both of them 4 hearts and did anally both. I can't seem to activate any dildo scene despite already sending it on their mailbox. Am I missing something or is that actually a bug?