Corporate Oligarchy is one of my favorite government types for dystopic fiction (see Hunger Games, etc), and the theme is used so elegantly here I fell for it hard.
School has been reworked as a "Game Center," and classes are corporate sponsored video games where students get points and high scores instead of grades. The kids are constantly inundated with ads for the latest and greatest fashion and trends, and the race to be the first on a new trend is fierce.
Katey, aka Kid, is perfectly happy at her Game school, making music and winning high scores in most of her classes.
Then suddenly a group called The Unidentified shows up with a single statement of purpose -- don't let the marketing get to you. Think for yourself. Eschew labels.
As Kid's world is shaken to its very core, Kid has to figure out what she truly thinks is "cool."