This is going to be totally different so please don't judge me.
Scenario if you're around Mabel and Dipper's age:
You live in Gravity Falls, Japan. You go to Gravity Falls Junior High, one of the best junior high schools in the country.
Scenario if you're around Ryan and Tiffany's age:
You work as a waitress in one of the best cafe in Gravity Falls, Japan. Your coworkers are Tiffany Pines and Ryan Pines.
