On the official site for the anime adaptation of the manga, written and illustrated by Yuu Tomofuji, Niehime to Kemono no Ou (Sacrificial Princess and the King of Beasts) the first promotional image of the project was unveiled. The press release confirmed that the premiere is scheduled for 2023, but does not reveal production details yet.
A prequel chapter titled "episode 0“, as well as the fifteenth and last anthology of the work in Japan. On the other hand, Tomofuji started publishing the manga in the magazine Hana to Yume from the publisher Hakusensha in November 2015 and finished it in October 2020. This is one of those cases where a finished manga is adapted.
Summary for Niehime to Kemono no Ou
Saliphie is the ninety-ninth female human sacrifice that serves as food for the king of beasts and demons, but despite this, she is not the least bit afraid as she has never had a family or home to lose, so she adopts a positive attitude and no longer fears have to be eaten. The king finds her interesting and keeps her at his side until his death. This leads her to discover the truth about the king of beasts and demons and ends up being the king's consort despite being a human. This drives the other beasts and demons insane, but the king is powerful enough to silence them all.
Source: Weird Natalie