A young demon ends up on earth and on instinct makes a contract with a young human girl for her soul. In exchange he agrees to be her friend. The two grow up together and remain close, to the point where the girl goes to him for dating advice. He develops feelings but isn't jealous, in his eyes those mortals only get her for a blink it time, when she dies he'll get her for eternity. In the meantime the girl starts to catch on that her friend might not be be all that he seems.