Full Metal alchemist is about two brothers who use "alchemy", which is a type os science useing the life force dranw from the death of people from another demension. They tryed to do a "transmutation" on a human to try and bring back there mom but it went wrong and his younger brother lost his body and got attached to a suit of armor. Now they are serching for a stone that is said to be able to ignore the rule of equivalent exchange, or to create something of equal value must be lost, so that he can giv his younger brother his body back