Studio Deen
The novel has received four manga adaptations, with one based on the main story and the other three revolving around characters in the series. An anime television series adaptation animated by Satelight aired on NHK E between October 5, 2013 and March 22, 2014. A second season by Studio Deen aired between October 4, 2014 and March 28, 2015. A third season by Studio Deen aired between January 13, 2021 and March 31, 2021.