Nils Holm unexpectedly finds himself in a foreign world with no memory of his past. Shortly thereafter, he is captured by a strangely graceful band of warriors and taken to the capital of the land. The interrogation by the local prince is not very encouraging for Nils. While waiting in the dungeon for his execution, he meets the wizard Narvidur. That same night, the city is attacked by enemy warriors, and amidst the chaos of battle, the two manage to escape. Alongside Narvidur, who becomes Nils' constant companion, he reaches the secret society of Euseria. There, Nils learns that this is not his first time in this world, known as Rûngnár by its inhabitants, and that his return is no coincidence. After the unfortunate end of his last stay in Rûngnár, he had severed ties with this world and the secret society. However, since the task that Nils had once taken on with a few companions remains unfulfilled, a veil of forgetfulness had to be placed over him to ensure his return. After persistent refusal, he finally agrees to resume the search for an unknown being, believed to threaten the existence of this world, alongside Narvidur, the witch Charlotte, the moon fairy Beliala, and the Rûngnár warrior Torfrida. Constantly pursued by the warriors of Rûngnár princes, they encounter countless mythical creatures. Soon, Nils realizes that he is in a world where earthly fairy tales come to life. And in the end, a remarkable surprise awaits them.