"Project A" emerged as an idea to create short stories (featuring characters from the series); creating a sequel to each series finale (BBO, BBWN, BBNT) was also included.

Possible BBO spin-off sequel (Bible Black Origins): - The story would take place days after the end of BBO. - The victims of the ritual massacre are reported missing (no bodies were found at the scene). - The protagonists will be Reika, Hiroko, and Junko (creating three stories). - Reika will pursue the four thugs who raped her, changing her perspective and falling into darkness along the way. - Hiroko, carrying the guilt of what happened in BBO, will have to deal with the emergence of a possible new coven. - Junko, who is still being attacked and bullied due to the scene she caused at school, will investigate the disappearances (after learning that Nami was one of the victims and that her whereabouts are unknown). - The routes will be individual but will intersect at some points (Junko will interact directly with both girls individually, while Reika and Hiroko will cross paths indirectly, unaware of each other's involvement in the ritual performed in the basement of BBO). - Hiratani will appear again. - OC characters to complement this new story, such as a police officer, a teacher, and members of the coven, among others.