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.

Sol, a 17-year-old teenager, moves with her mother to the Gonzalo's home, the actual mother's boyfriend. In this town, where from the beginning Sol only finds hostility, she must face bullying from her schoolmates and Gonzalo's harassment. While wandering the streets trying to find a way out, Sol meet a mysterious female dog with whom she establish a symbiotic relationship. It be this dog, the one that violently and surprisingly, always appear to defend Sol until the last consequences.