9/10 Bible Black Gaiden is the Prequel of Bible Black Series and shows what happened 12 years before the series. The main characters are Takashiro and Kitami when they were still students, besides that Kozono is another main character that didn't exist in the original series. The Story itself is again pretty interesting since it explains the Background to the first series and as well its nice to see takashiro and kitami as you girls. you might even feel sorry for Kitami now based on the things that happened to her 12 years ago. The Animation is great like Bible Black and it has again reallyarousing scenes, again alot of rape, futanari and yuri this time. Was a bit sad that there were just 2 Episodes but it was jsut the background story and i guess it didn't have much more to say.