Sariel (サリエル, Sarieru), also known as Mitsuki Sarue (猿江 三月, Sarue Mitsuki), is the main antagonist of the first season of The Devil is a Part Timer! He is an angel with the task to carry out the ruling of the declaration of the Fallen. He first attacked Emilia at a convenience store, disguised as a masked robber. In order to learn a bit about Satan and Emilia in the human world, he forges the identity of "Mitsuki Sarue", claiming to be the manager of the newly opened Sentucky Fried Chicken in Hatagaya.