Matsurika Kanriden

Matsurika, a female officer in the Inner Palace, had a little special skill, and that was "a better memory" than others. One day, she accepted a request to become a practice partner for a marriage meeting of a certain son of a distinguished family. However, the one who appeared was the Emperor, Hakuyou, who wanted to try having a marriage meeting?! And interested in Matsurika's special skill, Hakuyou even said, "For now, go and pass the civil exam"...?! A Chinese-style Cinderella story between an emperor and a girl! (Source: Kadokawa, translated)

On her thirteenth birthday, Rian came to Lychee Castle to ask the emperor of the Red Kanade Kingdom to admit her to the imperial court. She had studied hard to become the emperor's favorite consort, but when she finally made it to the audience hall, she was met by Xiao Tsuki, who had just usurped the throne and taken over as the new emperor. What's more, he announces something very surprising: he's going to welcome Rian as the Empress instead of a consort!? This is the beginning of a love story between Rian, who has become the usurper's empress, and the emperor, Xiao Yue, who has taken Rian to be his wife. (Source: Akita Shoten, translated)