 Produced by Geneon Universal Entertainment, Showgate, AT-X and Madhouse, the series is directed by Tetsurō Araki, with Yōsuke Kuroda handling series composition, Masayoshi Tanaka designing the characters and Takafumi Wada composing the music.Six DVD and Blu-ray volumes were released by Geneon Universal Entertainment between September 22, 2010 and February 23, 2011.In North America, the anime series was licensed by Sentai Filmworks for simulcast on the Anime Network Some of the more graphic scenes were censored.