Petra Winter, the notorious headmistress of Berlin's Fröbel-Gymnasium, is known for her strictness and harsh treatment of the school administration. Even the friendly janitor Christian Brenner has a hard time with the principal's uptight manner. To get one over on the hated Ms. Winter, her colleagues arrange for her to stand in for the PE teacher. Now the principal, who is feared by the pupils, has to look after the school's flagging soccer team. But what nobody knows is that Petra Winter is a passionate soccer fan. The janitor, who has his eye on the principal, helps her train the team for a crucial match. Over the course of this time, the headmistress softens more and more and realizes that friendship is more important than discipline.