Coral, the daughter of an earl, was a beautiful woman disguised as a man to serve as a knight of the royal guard. One day, she went on a diplomatic mission to a country called Karetsu. The prince was about to be executed for committing a crime Coral offered herself to protect him. She was almost killed, but a man saved her. “This man is handsome. He will be useful,” he said. Coral was given a punishment instead of being executed. She was forced to work in the imperial palace. The man had a hidden plan for Coral. Despite being a foreigner, he took her to the palace. However, everybody believed that Coral was a man. Even the queen she served was mean to her, she didn’t notice it.