Sword wakes up in a city that looks clean on the surface and rotten underneath, chasing a conspiracy nobody else can see yet. Sophie's brother vanished into the same darkness, which means they're not solving a mystery together, they're walking into the same trap from different angles. The show builds its tension in the spaces between what characters know and what's actually happening, making every new clue feel like you're stepping closer to something that wants to stay buried. Garo trades spectacle for dread. By the time you understand what El Dorado actually is, the conspiracy has already moved three steps ahead.

Russell City gleams with prosperity, but beneath its polished surface, something rotten stirs. Horrors, creatures born from negative emotions, spread chaos, and the secretive Makai Order fights them with knights and alchemists working out of small businesses. Sword, a hulking man who holds the rank of Golden Knight and wields the Garo armor and blade, learns of a plot that threatens the whole Order. His only lead is a single word: El Dorado. During a fight with a Horror he meets Sophie, a teenage girl whose older brother vanished years ago, leaving her a message with that same word. Sword, who lost his own younger sister in the past, agrees to join her, and together they set out to learn what El Dorado means and what became of her brother. The result is a dark action mystery built around two people pulled together by a single clue.