"Fullmetal Alchemist: Brotherhood" is a 64-episode anime adaptation of Hiromu Arakawa's manga, closely following its source material. The story is set in a fictional world where alchemy is a widely practiced science, governed by the principle of equivalent exchange: to create something, something of equal value must be sacrificed. The narrative centers on brothers Edward and Alphonse Elric, who attempt to resurrect their deceased mother using alchemy, violating the taboo of human transmutation. The experiment fails catastrophically, resulting in Edward losing his left leg and Alphonse losing his entire body. Edward sacrifices his right arm to bind Alphonse's soul to a suit of armor, and the brothers embark on a quest to restore their bodies.

Edward, now a State Alchemist with the title "Fullmetal Alchemist," and Alphonse travel across the nation of Amestris in search of the Philosopher's Stone, a powerful alchemical artifact capable of bypassing the laws of equivalent exchange. Their journey intertwines with the political and military machinations of Amestris, a militaristic state ruled by the enigmatic Führer King Bradley. The brothers uncover a conspiracy involving the Homunculi, artificial beings created from failed human transmutations, who serve as the primary antagonists. Each Homunculus embodies one of the seven deadly sins and operates under the command of a shadowy figure known as Father, who seeks to achieve godlike power by orchestrating a nationwide transmutation circle.

As the story progresses, the Elric brothers form alliances with key figures, including Colonel Roy Mustang, a skilled Flame Alchemist aiming to reform the corrupt military; Winry Rockbell, their childhood friend and automail mechanic; and Scar, an Ishvalan survivor seeking vengeance against the State Alchemists for the genocide of his people. The narrative explores themes of sacrifice, redemption, and the consequences of human ambition, culminating in a climactic battle against Father and the Homunculi. The brothers confront the ethical implications of their actions and the true cost of their quest, ultimately achieving resolution through their unwavering bond and determination. The series concludes with a satisfying resolution to the brothers' journey, tying together its intricate plotlines and character arcs.