Bible Black (バイブルブラック, Baiburuburakku?) is an eroge created by ActiveSoft in 2000 , and was adapted into an anime by Milky Studio. The adaptation of the original game was called La Noche de Walpurgis (The Night of Walpurgis) in English (and simply Bible Black (バイブルブラック, Baiburuburakku?) in Japanese), and consisted of 6 episodes. Additionally, there are 2 prequel episodes (Origin in US, Sidestory in Japan) and two special "ONLY" episodes. A sequel, titled La Lanza de Longinus (The Lance of Longinus) is currently being produced by Milky Studio as well, with 5 episodes already released. The game as well as both seasons of the anime have been translated and released in the U.S. by Kitty Media.

The whole series features frequent sex and horror scenes and revolves around a high school rumored to have been the base of operations of a coven several years ago (pre-2000). The school's unofficial "Witchcraft Club", as they called themselves, practiced black magic in the underground basement hidden away at the institute. Teachers, students, professors, and staff practicing the dark occult religion involving incantation sex and sacrifices of innocent victims is a common and recurring theme in all things Bible Black.

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