Based loosely on the early episodes of the Fullmetal Alchemist anime, the story opens with a troubling pattern: people are vanishing across Amestris, said to have been taken by monsters. In Resembool, Edward and Alphonse Elric encounter an enigmatic alchemist named Jack Crowley and a mysterious presence called the Phantom, both of which seem connected to the disappearances and to strange stone creatures called Golems appearing in the countryside. Investigating further, the brothers meet archaeologist Arlen Glostner, who is studying the ancient civilization of Lebis. The trail leads to the ruins of Siam-Sid, the lost capital of Lebis, and the truth behind both the Golems and the missing people.