This is a basically a what if Reverse Falls was an anime / AMV / animation meme whatever you want to call it.

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If you are wondering what happen in the video, I wrote below my headcanon for Reverse Falls and the video explanation.
My headcanon for Reverse Falls:
In this Au Mable and Dipper didn't go to Gravity Falls when they were 12-3 because Mabel, in order to defend herself and Dipper form some bullies, badly hurt one of them. So their parents decided to move away from their city and to not send them to Grunkle Stan.
After this Mabel and Dipper began to be more confident in themselves and to be really good at lying, deceiving and controlling poeple.
Basically they only trust each others and no one else.
Four years after the incident with the bullied they are sent to Gravity Falls for the summer and there they find the 2nd journal and recreate the tent of telepathy.

Pacifica finds the thruth behind her family alone. Shattered by this revelation she ran away from home (just for one day if you were wondering) and met Gideon where he canonically find the 2nd journal . Gideon never found the 2nd journal because of their meeting and after that he and Pacifica become friends.