In Russell City, a place overshadowed by corruption, the Makai Order stands as the final barrier against the chaos caused by Horrors, malevolent entities born from negative emotions. Concealed within various businesses, this order deploys skilled Makai Knights and alchemists to battle these monstrous threats. Among them, Sword, a formidable man granted the prestigious title of Golden Knight, wields the powerful Garo armor and blade. He alone senses a looming danger to the Makai Order, hinted at by the cryptic phrase 'El Dorado.' While facing a Horror, Sword crosses paths with Sophie, a young woman whose brother vanished years ago under mysterious circumstances connected to the same enigma. Together, they embark on a quest to unravel the secrets of 'El Dorado' and solve the enigma surrounding Sophie's missing sibling.