if you don't understand whats happening in the beginning watch this video for clear info : https://youtu.be/bu7wdnGp_x4?si=zFphtb9dM5oGSQlG
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where did the au come from?
it's from my first series (mrs.afton tragedy) they're the au where mike messed up the past and caused to create this alternate universe, and they're corrupted and messed up, that's all.