Help, I Shrunk My Teacher

This is the story of eleven-year-old Félix, who no one believes when he says he "shrunk" the school principal down to 15 centimeters. Although he doesn't know how it happened, it probably has something to do with the ghost of the school's founder. Félix now has the problem in his hands, or more precisely, in his backpack. That's where the ever-vocal mini-principal is now. With the help of his friend Ella, and despite his rival Mario and the latter's father, Félix must try everything to restore her to her normal size. If only she'd stop being so annoying!