Clarisse, second daughter of Viscount Fahrenheit, was treated cruelly by her family. When she became nineteen, her father arranged a marriage for her...to marry Margrave Gutenberg, who asked the King for the "Jewel of Fahrenheit" as his bride, as a reward to his victories in the war. But the "Jewel" was her sister, Matilda. Clarisse was a substitute bride.Clarisse was almost happy that she could get out of her miserable life at home, but also afraid that the margrave would know she was a substitute.It was a surprise when she found out that he was rather a thoughtful and handsome man. She started to enjoy spending days with him, and it seemed like he feels the same way.Then came the day that her family secret was revealed...!