Pigeon Blood

Both of these hentai are about girls brought into a mansion and made to become slaves. They both have a lot of BDSM and are very hardcore with fetishes taken to the extreme. Bondage Game revolves around several girls, while Pigeon Blood is mostly about the one main girl. Pigeon Blood is very masochistic, while Bondage Game, though it does have some masochistic scenarios, is more involved around very extreme, and sometimes downright disturbing fetishes. Both are very dark toned, and could be classified as horror, particularly for Bondage Game. They're both quite strange, and liking one won't guarantee you liking the other, but if you're looking for a disturbing or hardcore hentai then you'll definitely be entertained. read more 

Both anime would go under the 'guro' genre, tons of hardcore scenes in both of these 

u crossed the line when u watched bible black so why u dont try something more weird? 

They are both psychological thrillers with a BDSM theme.  

It´s also S/M, but Pigeon Blood is even more kinky