Agnes, a maid at a count's manor, had no memory of when she was young and was bullied every day because of her lack of visible emotions. One day, she was sent to marry Gilbeyd Deddricks, a man feared as the Grim Reaper Duke, in place of the count's daughter. However, the duke had no desire to get married and decided to allow Agnes to stay in his home until he found her a new groom. Unlike the rumors, he was quite kind, so Agnes slowly opened up to him. She also began remembering not just her lost memories but also her hidden power...