The story takes place in a world where alchemy is quite developed. The "alchemy" in this world is based on understanding the inner law of matter: understanding, decomposition, and reconstruction are established. Alchemy must be carried out in accordance with the law of "equivalent exchange": To obtain something, it needs to be exchanged at the same price. If the price is not enough, any part of oneself (part of the body, memory, etc.) needs to be filled as a price and taken away.
Edward Elric and his brother Alphonse Elric missed their mother who died when they were young. In order to see her mother again, they carried out the biggest taboo in alchemy-the cultivation of the human body . But because of the backlash during the training, Al lost his whole body and Ed lost his left foot. In order to exchange for his younger brother, Edward sacrificed his right hand as a price to refine his younger brother’s soul, and fixed his younger brother Alphons’ soul to On a pair of armor. Since then, Edward and Alphonse have embarked on a journey to regain their bodies in order to get back what they have lost.
Edward's lost right arm and left leg were replaced by the steel prosthetic " Auto Mail ", so he was awarded the title of "steel", so he was called "Fullmetal Alchemist".
