Prologue

(A/E: This is my first Gravity Falls story (aside of Dipper and Pacifica's MLP Night) and due the T rating, it's gonna be the equivalent of a rated TV-14 episode (kinda like Family Guy and Rick and Morty). It's gonna have darker tone, but I'll try to keep the lighthearted spirit of the show. Anyway, I hope you enjoy it!)

The story began in a dark hallway where two teenager girls (a blonde one and a black-haired one) were exploring it. They both were wearing uniforms that consist a white buttoned blouse, purple tie bow, purple vest, magenta jacket, pleated skirt, purple tights and black dress shoes. The black-haired one had long hair tied to a pink ribbon and the blonde one looked EXTREMELY familiar.

"Ugh, I don't know why you convinced me to come here, Jessica" the blonde girl said.

"Come on, Pacifica, you told me that when you were a kid, you've been through mystery stuff in Gravity Falls" Jessica said.

"Well, it's not something I'd like to remember...well, except..." Pacifica said, remembering Dipper.

"Pacifica, LOOK!" Jessica said, looking at a mural with something written in an unknown language "It's a mural and...something is written on it"

"Yeah, I can't read 'Doodles'" Pacifica said.

"They're not doodles, it must be an ancient language that nobody knows" Jessica said.

"Whatever, can we get out of this stinky place?" Pacifica asked.

"Come on, Pacifica, we could discover one of the greatest mysteries of all-" Jessica said

*tumbling*

"What the hell was that?" Pacifica asked.

"It seems that something is coming" Jessica said

Something came out of the shadows: it was only the siloruthe of a spider-like creature.

"Jessica, what do we do?" Pacifica said.

"RUN!" Jessica screamed.

Both girls ran away as fast as possible, but the creature was faster enough to each them.

"AAAAAAAAAAAHHHHHHHH!" both girls screamed as the creature attacked them.

The screen turned black.

As an orchestra version of the intro was played, a book called Gravity Falls: A Summer of Mysteries appeared. The book was open, showing pictures of the show: our main heroes (Dipper, Mabel, Stan, Wendy, Soos and Waddles), the Mystery Shack, the residents of Gravity Falls (Grenda, Candy, Wendy's friends, Robbie Stacy Valentino, Pacifica Northwest, Lil' Gideon, etc.), all the strange creatures of the show (like the gnomes, the Multi-Bear and the unicorn from 'The Last Mabelcorn'), the three journals, the portal and finally...Bill Cipher. Then it zoomed out as Bill's triangle appearance was transformed into the first letter 'A' from the word 'Academy', which is part of this story's title:

ST. LUMINOUS ACADEMY MYSTERY

End of the Prologue