Bibi and her friend Moni get bored during a visit to the castle. That's why Bibi starts to fool around, with the result that the two girls end up in a secret room. Astonished, they discover the portrait of Princess Karla von Klunkerburg, which looks like Bibi's face. When Bibi behaves like a princess the next day, it's clear she has the virgin witch disease. And there is only one thing that helps: She has to return to the place of her dreams and spend there 99 minutes without interruption. Not an easy task for a small and inexperienced witch.