After Weirdmaggedon, Dipper stayed in Gravity Falls to study under Ford while Mabel went back home to their parents. Being angry at Dipper for choosing to stay, Mabel becomes distant from him. Over the years Dipper struggles with PTSD from Bill, barely able to sleep and function but feels he can't tell anyone or he will just be a bother to them. It feels himself slowly losing his sanity until an insane demon makes things starting becoming clear once again.