Mercedes, Max, Krull, Stephan and Karin live in an apartment in Munich. Krull loves Mercedes in vain, Karin thinks boys are horrible and takes part in competitions. She wins an evening with Udo Lindenberg. Pursued by Krull, Karin and Mercedes leave the apartment. Stephan and Max are left alone. While Karin goes to the hairdresser for the evening, Mercedes meets Simon, who drives a large truck. They decide to get married and have seven children.

The story of two young lovers takes a tragic turn as the girl falls in love with the boy's father.