I was looking at animenewsnetwork comic book rankings and its 14th volume of this series already sold over 100,000 volumes.
http://www.animenewsnetwork.com/news/2016-03-16/japanese-comic-ranking-march-7-13/.99872
What I am wondering, why does this manga series does not have an anime yet? Usually a manga series that sells this well would have an anime by now. A similar series, Saiunkoku Monogatari, got an anime adaptation with two season of 39 episodes. So the setting and the situation should not be the reason why it is not getting an anime.