Manga by author Xy Comics

The Duke's Daughter, known as the "The Empire's First Lady," is unexpectedly broken off from her engagement. The noblewoman, once at the pinnacle of society, is about to become the laughingstock of the Empire. In a bid for revenge against her arrogant fianc, she accidentally causes him to lose his memory. Seizing the opportunity, she crafts a fake "memory" for him, making him believe that he has always deeply loved her...