Set in the fictional medieval empire of Saiunkoku, the narrative tracks the exploits of Shuurei Kou, a scion of a noble house that has fallen on hard times. Her father holds the position of librarian in the Imperial palace, a role that commands prestige and respect yet provides little compensation. Shuurei instructs at the temple school and takes on odd jobs to make ends meet, though her ambition is to pass the imperial examinations and secure a government post, a career path forbidden to women. Shuurei's plans are abruptly halted when the Emperor's Grand Advisor makes a startling offer: join the imperial household for six months as the young Emperor's consort and teach him to be a responsible ruler. Success would yield a great financial reward. The story details Shuurei's growing relationships with the Emperor and other court members, the intrigues surrounding imperial politics, and Shuurei's commitment to better herself and her country.