Martin, a poor student, volunteers to go on a quest to find a cure for the princess Adriana, who is stricken with a strange illness. Unknown to Martin or anyone else, the princess is actually under the spell of the powerful magician Andlobrandini, who is preparing a rejuvenating elixir made from the blood of nine men's hearts.

Julie, the youngest daughter of a bankrupt merchant, sacrifices her life in order to save her father. She goes to an enchanted castle in the woods and meets Netvor, a bird-like monster. As Netvor begins to fall in love with Julie, he must suppress his beastly urge to kill her.