Koukyuu Kisaki no Kanrinin

Yuuran, the daughter of a prominent merchant, was married quickly due to an imperial order requiring her to oversee the imperial harem. Her husband, the Right Chancellor, was young and attractive, and she apologized to him for marrying someone her own age. However, when she arrived at the palace to begin her duties, a beautiful woman greeted her and introduced herself as her husband. The pair must now navigate the harem together, with the husband disguised as a woman.