On Wikipedia, it lists that the manga is still ongoing, with the latest volume released in March 2014. The anime however began airing in October 2010 and I'd assume it was on the works for a while.
After seeing the end of the anime and how things seemed to be resolved, I am wondering how much of the Otome Yōkai Zakuro manga was adapted into the anime? Did it deviate from the manga at any point in order to get a conclusion?