17-year-old Kai likes going to school. Not only because he can expand his knowledge in his favorite subject, math, but also because of his best friends Peter and Trina. When the three of them find themselves at the mercy of a teacher one day, they realize that they have to take action. Abandoned by the school administration and their trusted teacher, the class grows even closer together and tries to make itself heard with the facts. However, when the incident repeats itself, Kai knows that he will not remain silent this time and finds his own way to process what has happened – while at the same time holding up a mirror to the school administration.