is a Japanese manga series written and illustrated by . It was serialized in Kodansha's manga magazine Aria from April 2011 to May 2013, with its chapters collected in four volumes.
Written and illustrated by , The Prince in His Dark Days was serialized in Kodansha's manga magazine Aria from April 28, 2011, to May 28, 2013. Kodansha collected its chapters in four volumes, released from October 7, 2011, to August 7, 2013.
In North America, the manga was licensed for English release by Kodansha USA. The four volumes were released from September 27, 2016, to April 11, 2017.