Realising that magic could not solve everything, a young wizard named Gregory decided to give up magic forever. Instead of demons and dragons, he now faces the boring life of the city. But when his friend Itsuki disappears into a mysterious Tree-Forest, he realizes he must use his powers again to save his friend. The result is a breath-taking race against time that leads to the depths of a wonderful and wild world, rich in surprises but also in danger.