Envy is a Homunculus—a being created from a failed attempt at restoring a human's body—and he normally cares about nothing but himself. When his "sister", Lust, orders him to assassinate a human who has uncovered valuable information on the Homunculi, his victim ends up being shot off a building before his very eyes. Uncertain on WHY he does, Envy saves him. What will become of Envy and this human? This species that he absolutely loaths?