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The world in the story is based on a medieval European framework, with the existence of dragons, elves, and goblins alongside humans, making it a typical fantasy world within the Tolkien system. Gods and demons are constantly at odds, with the gods fighting to protect the world, and the demons battling to gain the Staff of Destruction to annihilate it. The Red-Eyed Demon King and the Red Dragon God fight for their respective purposes. The Red Dragon God defeats the Red-Eyed Demon King and splits it into seven parts. To prevent the actions of the demon race, he transforms into four incarnations to guard the four directions. A thousand years ago, one part of the Demon King awoke. It led the demons to challenge one of the Red Dragon God's incarnations—the Water Dragon King. Four of the Demon King's five underlings set up a barrier, allowing it and the Dragon King to directly duel the Water Dragon King. Later, the Demon King's plan failed, and the Dragon King was sealed. The actions of the demon race gradually subsided... A thousand years later, a "genius magical girl" named Lina Inverse is born. The story begins when she encounters thieves in the forest and receives help from the wandering mercenary Gourry Gabriev. From then on, he declares himself her guardian and becomes her traveling companion. Their destinies are also inextricably linked to the Demon King...