Two friends embark on a investigation to find the classmate who, fifteen years ago, unleashed a massacre at their institute.

The principal at a local high school has developed a reputation among the students and teachers for his unorthodox methods. When he comes down hard on the rebellious Cata for suspected drug use, he discovers there is more to her story. He sets out to help her, a decision with precipitous consequences.

Rocío can’t handle the idea of separating from her best friend, who’s about to move and change schools. Her pain and frustration translate into spite until the increasing tension between them becomes irreversible when they clash in a duel at the arcade where they meet every afternoon.

Lila, a dedicated cleaning staff employee, runs an unofficial cafeteria with her friend Marcela. When she is officially promoted to direct it, tensions arise with Marcela that upset the delicate balance of the office after 30 years of camaraderie.