Lots of girls long for a fairy-tale prince to sweep them off their feet. Not Anna. She'd prefer to find her own path in life first, before some guy turns up out of the blue and turns everything upside down. But then her brother Raoul comes home one day with a frog. Before Raoul can torment the little creature to death, Anna manages to rescue it and remembers the old fairy-tale about the prince who had been turned into a frog. In a light-hearted mood, she picks up the frog and actually kisses it ... and something incredible occurs - the frog is turned back into a prince - into Prince Dietbert von Tuempelberg. Once Anna has recovered from the shock, she realizes that there are certain practical problems to be faced if you are suddenly responsible for a 1000-year-old Frog Prince. For Dietbert, though, far more is at stake. He meets up again with the immortal wizard who put the spell on him, and learns something about the curse that he didn't know before; after 1000 years it is no longer possible for a kiss to turn the frog back into a prince permanently. And in Dietbert's case, those 1000 years are almost over. He can only be saved if he finds a pure young girl who loves him with all her heart. At first it seems as though Dietbert's problems may be over; after all, Anna is the ideal candidate. But somehow it doesn't work out so easily ...