HI this is about the boy who became a demon and saved Gravity Falls

Dipper Pines follows Bill to Reverse falls in hope of keeping him from getting a vessel. Bill gets ticked off when Dipper prevents Reverse Pacifica from making a deal with him. He leaves Dipper Pines in Reverse falls and Dipper Gleeful into Gravity falls. They both must find a way home. In the meantime Gleeful gets to deal with the crazy and Goody Two Shoes Pines family, While Pines learns he is dating Pacifica and his sister is apparently sorta evil and insane. Great.