The world in the story is based on medieval Europe. In addition to humans, there are dragons, elves and goblins. It is a typical fantasy world in Tolkien's system. Gods and demons are constantly fighting. Gods fight to protect the world; demons fight to fight for the long staff to destroy the world. The Red-Eyed Demon King and the Red Dragon God fight for their own goals. The Red Dragon God defeated the Red-Eyed Demon King and divided it into seven parts. In order to prevent the actions of the demons, he turned into four clones to guard the four directions. A thousand years ago, a part of the Demon King awakened. It led the demons to challenge the Water Dragon King, a clone of the Red Dragon God. Four of the Demon King's five subordinates set up a barrier, and it and the Demon Dragon King directly dueled with the Water Dragon King. Later, the Demon King's plan failed and the Demon Dragon King was sealed. The actions of the demons gradually became silent... A thousand years later, Lina Inbas, who called herself a "genius beautiful girl wizard", was born. The story also began when she encountered thieves in the forest and got help from the wandering mercenary Gori Kabreev. From then on, he called himself Lina's guardian and became her traveling partner. And the fate of the two was inextricably linked to the Demon King...