Elmar just adores his big sister Carla. She is always ready to help and she has taught him everything: swimming, handstands, rolling backwards, whistling with fingers, squinting, and doing somersaults. When Carla announces that she will move to another city to attend university, Elmar is shocked. How is he supposed to survive without his sister? Carla must not leave. But how can he make her stay? Fortunately, his young sister Milli has an idea...