Ōoku: The Inner Chambers is a oNA (web) anime that premiered in spring 2023, produced by Studio DEEN.

About the production: the story comes from a manga, there are 10 episodes of about 28 minutes and its current status is "finished".

Its main genres are drama, romance and slice of life, with themes such as Matriarchy, Historical, Politics and Pandemic.

On AniList, Ōoku: The Inner Chambers has an average score of 73%, a good score, and appears on 13,699 users' lists.

In Edo period Japan (1603 to 1868), a strange new disease called the Redface Pox has begun to prey on the country's men. Within eighty years of the first outbreak, the male population has fallen to a quarter of the total female population. Women have taken on all the roles traditionally granted to men, even that of the Shogun. The men, precious providers of life, are carefully protected and the most beautiful of the men are sent to serve in the Shogun's Inner Chambers. (Source: VIZ Media) Note: The first episode has a runtime of 1 hour and 18 minutes.

Official synopsis from AniList.