Angel of Darkness (Japanese: 淫獣教師, Hepburn: Injū Kyōshi) is a four-part hentai anime series released in 1994 by Pink Pineapple in Japan.

[2] During a rainy night in a thunderstorm, Professor Goda is digging under a large tree in the schoolyard of Siren Academy, a prestigious boarding school for girls.

The scene then shifts to an underground basement in the school's church, where Professor Goda and The Director are raping a freshman student who is tied up and gagged.

Goda is a young science professor at the prestigious Siren Women's Academy who broke a seal on a tree and was attacked and possessed by a tentacle monster.

[3] Considered soft porn, Angel of Darkness' attempts to merge the magical girl anime formula with the tentacle rape hentai genre.

This was done in order to circumvent stringent Japanese censorship laws at the time that did not allow the animation of the pubic region and identifiable genitalia.