It's summer vacation, and Joanna is ready to put in many hours at the Toy Store and at the dance studio before heading off to college in the fall. There are performances and competitions to prepare for at the studio, and at the Toy Store... there is Luke.
Luke has a lot of baggage, but something about him continues to draw Joanna in. And then there is Mike, whose seemingly harmless crush on Joanna starts to become creepy. He pesters her and says inappropriate things to her, making work more and more uncomfortable. Luke wants to help, but he lacks the maturity and confidence to be someone she can count on. Soon Joanna's days become nothing but a roller coaster of nonsense with Luke, while Mike's affinity becomes increasingly disturbing.
Tanzen – the German verb "to dance" – is about the summer before Joanna moves away for college. It is a summer of dance: dance performances that feed an unhealthy obsession, and a dance of the heart that disrupts everything Joanna had bargained for.