Ryuu Heika no Okisaki wa Okotowari Shitai!: Ryuu Heika wa 10-Banme no Sobahi wo Dekiai-chuu

Iris, the head of the Regrett family, is on the verge of ruin. Se planned to fire all his servants, give up her title and territory, and become a commoner. However, her former butler, concerned about her, brings up a marriage proposal to become the 10th concubine of King Hybern, also known as "His D...

Source: MyAnimeList