Some time after the events of Walpurgis Night, all those involved in the gruesome rituals graduated from high school. Everyone went their separate ways. Imari is now a police officer. However, the essence of Kitani Reiki lives in her. Imari works in a division that deals with supernatural phenomena. She is given an important assignment involving a dangerous mysterious artifact - the Spear of Longinus.

Here is one of the most famous hentai games in the world - "Black Bible: Walpurgisnacht", the first part of the famous series. In May, when earthly and supernatural forces are at their peak, Walpurgis Night falls. A group of girls from a Satanic club decide to perform a sacrifice to open the gates to hell. The ritual is successful, but in the end all its participants face a terrible fate.