Bible black is an all time classic in the hentai genre. It is about a high school protagonist using a magical bible to get laid a lot. Amazing storyline with a bit of mysticism and theological elements, satanic rituals with decent scenes, tho about 50% of them are futanari, so if you are not into that, probably skip, but I think that watching hentai for the plot is more important than watching for the fap. art is pretty rusty but not too much, the music is breathtaking and over all this is a hentai to remember. Despite its age I would easily rank it asone of top ten hentai of all time.