The character Kohta Hirano bears a striking resemblance to Kouta Hirano who created the series Hellsing.
Based on a Japanese manga series written by Daisuke Satou and illustrated by Shoji Satou. It was serialized in Fujimi Shobo's Monthly Dragon Age between the September 2006 and May 2013 issues, but was left unfinished following Daisuke Sato's death in March 2017.
The first episode received an early screening on June 27, 2010 in Tokyo's Theater Tsutaya, in front of selected viewers who were chosen from a nationwide postcard lottery held until June 14. The earliest television broadcast started on July 5.