The anime's story is set in a prosperous city named Russell City. Even as the city celebrates its success, a conspiracy that threatens to shake its world has been set in motion. A man named Sword is the first to hear the earliest stirrings of the plot, and throws himself into a shadow war in order to expose it. His only clue is the keyword "El Dorado." He meets Sophie, a woman searching for her older brother who left her with only a message with the same word: "El Dorado." With Sword having also lost his younger sister in the past, both are drawn together by the word, and work together to find out its meaning. 

(Source: Anime News Network)

In the capital city of an elegant, feudal society, a powerful spiritual barrier protects people from demonic monsters known as “horrors”—at least, those lucky enough to live in the northern part of the city. For the commoners who live to the south, it’s a completely different story. As soon as night falls, the horrors begin their dark hunt, feasting on the souls of any humans who cross their path. Against unbeatable odds, the fate of the city will fall to a small group of warriors dedicated to protecting the citizens and fighting through the night. (Source: Funimation)

The story of the anime begins when the king's adviser launches a witch hunt, which endangers the Makai Knights and Makai Priests, who are supposed to protect people. A Makai Priest who has been condemned to die at the stake gives birth to a child, Leon Lewis. The child is rescued by his father, a Makai Knight, but never meets his mother. When he grows up he inherits the Gold Armor as a descendant of the Gold Knights. Meanwhile the king's adviser has taken over the country as the king has become ill, and Prince Alfonso has been driven out with his mother. He comes seeking the legendary Gold Knight in hopes of retaking his kingdom.
 
(Source: Anime News Network)

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