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...! (Source: MangaPlaza)

Clarisse, a viscountess living in the royal capital, has always been compared to her beautiful elder sister, who is known as “the jewel of Farenheit.” She is forced to lived in the shadows, pressured by her family to keep a low profile. When Clarisse is nineteen, she marries Siegfried Gutenberg, the “man-eating frontierman,” as a reward for his success in war, in place of her sister. It turns out that the frontier count is a stoic, but caring and surprisingly charming man who treated Clarice kindly. Clarisse, however, feels guilty about being a “substitute bride,” and is afraid to entrust her heart to him. Then news of her sister's wedding arrives from the capital, and they decide to visit the capital for the occasion. But Clarisse's family hides a big secret, and the circumstances of her marriage are very different from what she expected! In this royal love fantasy, an unfortunate lady finds happiness with the love of her life on the remote frontier! (Source: Kadokawa, translated)

Rain was born as the king's illegitimate child. She lived quietly in the royal palace, invisible to everyone. Then one day, a major conflict breaks out at the border, and she is forced to go to the dragonkin country as a false princess—a hostage! Though frightened, she is warmly welcomed by the dragonkin, including Prime Minister Sigurd, in the neighboring country, leaving Rain bewildered. She soon finds herself drawn to Sigurd's sincere kindness, but he is actually the person her father, the king, ordered her to assassinate! (Source: Ichijinsha, translated)