Fullmetal Alchemist: Fullmetal Edition, Vol. 4

In an alchemical ritual gone wrong, Edward Elric lost his arm and his leg, and his brother Alphonse became nothing but a soul in a suit of armor. Finding themselves at a crossroads, the brothers seek the guidance of a teacher, but her lessons are harder to master than any alchemy.

Fullmetal Alchemist: Fullmetal Edition, Volume 4, by Hiromu Arakawa.