Eugene swore obedience to Logan, the vampire who killed his parents. Eugene, who has become his servant, wants to prove his love to him by playing the piano, but Eugene has long since lost his human feelings, and he cannot express his love. One day, Eugene accidentally witnesses Dominic's affair. She is fascinated by Dominic's intense emotions as a human and wants to learn from him. However, Dominic asks for Eugene's body in return, and the two get closer as they shuffle their bodies...