Mendosa, the chief adviser of the king of Valiante, begins a campaign to hunt down "witches," resulting in the deaths of many magical knights and their sorcerer assistants. Anna, a sorceress married to the knight Herman Lewis, gives birth to a son before her execution. Herman takes their child, Leon, and flees, raising him to be the heir of the legendary Golden Armor. By the time Leon grows up, Valiante is completely in the control of Mendosa, who drives out Prince Alfonso and his mother. Alphonso decides to seek out the man who inherited the Golden Armor to reclaim the throne and save his people.

In a prosperous city named Russell City, an omen that threatens to shake its world begins to move within it. A man named Sword is the first to hear the first stirrings of the plot, and throws himself into a shadow war in order to expose it. His only clue is the key word "El Dorado." He meets Sophie, a woman searching for her missing older brother who has only left her with the same words: "El Dorado." With Sword having also lost his younger sister in the past, both are drawn together by the words, and work together to find out its meaning.

2016 film by Koichi Sakamoto

A knight in a suit of golden armor battles with a magical beast out to destroy the world.