Ookamikakushi is an adaptation of the 2009 PlayStation Portable visual novel of the same name, developed and published by Konami, with Ryukishi07 of Higurashi no Naku Koro ni fame as game director and the manga author duo Peach-Pit as character designers.
The game this is based on was conceived after a concept by Ryuukishi07 and with designs by Peach-Pit.
The anime was released on DVD and Blu-ray by Sentai Filmworks as Okamikakushi: Masque of the Wolf on May 28, 2013 and December 16, 2014 respectively.