Deadly Sins is a story about an angel named Dido who fell in love with a beautiful human. To prove her love to him, he insisted that she sacrifice her wings and fall to Earth to be with him. As soon as she fell to Earth, the beautiful human quickly revealed that in reality, he was a demon in disguise. Heartbroken and alone, Dido roamed Earth in search of love and a sense of purpose. On her journey, she met the seven deadly sins.