Diabolus: Kikoku is a two-episode adult OAV produced by PoRO and based on a DarkShelf game, featuring a plot where students must satisfy a spirit's desires. The story, which follows a spirit haunting female students, is detailed in a 2009 release noted by IMDb. For further production details, visit Anime News Network . AI responses may include mistakes. Learn more Diabolus - Kikoku (OAV) - Anime News Network