This is about a girl similar to Kidd, Tsubasa, who accidentally traveled to a Western-style country where the school was 200 years ago with a time-travel magician she had known for three years in a century-old school, and unfortunately married the king, Ye. A lot of things happened during her time as a princess, such as assassinating the Queen Mother of the "Arthur Kingdom" during her wedding; meeting a general from the Eastern country "Xia Qi Kingdom" while going shopping and inexplicably becoming his son's godmother; going to the "Xia Qi Kingdom" to steal information, etc. There are also some things that let Tsubasa know about his own mystery. . .