Grayrock High is not your ordinary academic institution; it's a fortress for the wayward, housing some of the most notorious young troublemakers. The air of this grim establishment is thick with rebellion and despair.

Its teachers, a mix of callous enforcers and morally compromised figures, rule with an iron fist, their authority enforced by technological collars worn by each student. Control and punishment are woven into the fabric of daily life here.

Below the decrepit classrooms, when the moon is high in the sky, starts the school's darkest secret—the Underworld, a gladiatorial arena where students are pitted against each other in brutal combat to win basic necessities. Within these walls, every student has a story marked by delinquency, a unique fighting style, and a fierce desire to survive.