Sophie Bloom was just an ordinary office worker but her life changes when she meets the hard-working devil - Helliot Edgewing. She doesn't believe him at first but he's actually a real devil! To make things worse, he thinks that she's a succubus! He's so handsome and sweet so Sophie lets him think that she's a succubus even though she's just an ordinary human girl. Will Helliot find out Sophie's secret? What will the devil do when he finds out he's been lied to?