Leopold Summers has a horrible life. All he has ever wanted was to escape his loneliness and abusive parents in his hometown in Vermont. One day, he puts a plan of his into action: summoning an angel. However, this angel is not exactly how he imagined and it hurts him. To get revenge, Leo decides to summon an angel's worst enemy: a demon, or so he thought anyway. The demon does not appear as expected either. Together, Leo and the demon become the best of friends. They try to make up for his lost childhood, learn magic to defeat the angel, and learn the truth about the magical species known as the Daimones.