J--'s life is consumed by the roller coaster video game Coaster Boss, and by the power she exerts over the pixelated theme park attendees. Her life outside the game, however, is less controllable. Me. I'm such a big space. I break the universe, a glitch. She's navigating ADHD, the loneliness of middle school, and an overwhelming crush on a girl named Junie. J-- is convinced that Junie sees her as who she really is, a person who isn't "bad" just because she doesn't stay quiet and sit still in class. As a person who is realizing that the name she's been given doesn't really fit her. And that maybe boy doesn't either. Glitch Girl! follows J-- from fifth to seventh grade, from the beginning to the end of her obsession with Coaster Boss, and to the start of a new friendship. When J-- meets Sam, a nonbinary classmate, she begins to realize that it's okay to not fit into neat, pixelated boxes.