Kadokawa originally announced an anime adaptation of the light novels in June 2012,[6] and streamed a trailer for the series in July 2012.[7] No more information about the series was revealed until April 13, 2018, when it was announced that the series would be an original video animation (ONA) by studios Gonzo and Stingray.[1] The series will be directed by Hideaki Iwami and planned by Katsuya Iwamoto, with scripts by Kenichi Kanemaki.[1] Junichi Takaoka serves as the series' character designer and as chief animation director, the latter assisted by Takeshi Kusaka, Yuji Hosogoe, and Norimoto Tokura. Art design for the series is provided by Masayo Kobayashi, Ayumi Sugimoto is the art supervisor, and Shin Watanabe is the art director. Miyuki Mizumaki serves as color designer.