Imaginary

Bill has been your best imaginary friend since you were little. But when you start to grow up you start to ignore him and try to forget him, he enrolls to your school to assure you.

Dipper and Mabel are like family to you, but Bill wants the family pine extinct, will you be able to change that or will everything just blow up in pieces?

In this story, Bill is a demon. Everything is the same but somewhat different.