Wallflower Blush actually manages to erase the memories of the rest of the 6 with the memory stone. But instead of getting their memories of their entire high school life erased, she erases the memories of all of the friendships they made after attending CHS. Now, It's up to Sunset Shimmer to fix this wrong reality and get everyone’s memory back. But seriously, How?
Starts with an alternative ending to EG special : Forgotten Friendship