YouTube sensation Mia Fizz loves three things: her family, the Miacorns (her fans!), and her BFF, Briony. When Briony is chosen to direct a play for her after-school club, she asks Mia to oversee the makeup design—a natural fit for a YouTuber whose makeup looks get over a million views. But when some of the actors start looking to Mia for advice on their performances, Briony isn't so thrilled. That's her job, after all. With hurt feelings on both sides, backstage drama, and a premiere fast approaching—not to mention an endorsement deal gone sideways thanks to a super-embarrassing unicorn costume situation—will Mia and Briony be able to resolve their differences so that she show can go on?