Koori no Koutei no Torikago no Naka de

Rowena, the beautiful princess beloved by all the people of Bennett, is falsely accused of murdering her sister by her half-brother, the First Prince Chetston, and imprisoned in a dungeon. Her happy days are turned upside down, and she endures five years of abuse in prison. When Rowena is finally released from the dungeon, she is then handed over as a hostage to Emperor Fein of the enemy nation of Osborne. Fein and Rowena were childhood friends, but after a falling out, he too has led a harsh life and has now risen to become a ruthless emperor. Does Fein still hate her...? Where will the princess, who has lost everything, end up—an ice cage, or something else?

(Source: Kadokawa, translated)