Medialuna, the little princess, has been bewitched by the powerful witch Gualichu and cannot sleep at night. While everyone else in her kingdom sleeps, Medialuna travels into a world of witches, princesses, monsters and fantastic creatures from legends and myths. She shares with them great deeds and reveals tangled mysteries until dawn. In this episode, Medialuna meets Princess Yagua, who is caught in a trap made by Gualichu. Medialuna, Petunia and Chacabuco work together to rescue Princess Yagua.