From the back cover:
Prom is tomorrow, today's a math test and an alien invasion, and your powers have only just returned after the Battle of Band trip. Good thing your lab partner is an extraterrestrial princess and your best friend is a secret vigilante. You have your suspicions about the class rep, too, but whatever their deal is, they're keeping it quiet.
Super Destiny High School Rumble!! is a tabletop RPG that uses the Apocalypse World Engine for fast character creation and rules-light, collaborative storytelling.