Bondage Game: Shinsou no Reijou-tachi

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 

Protagonist train girls into sex slaves for the rich, The girls are trained through experiments. Both end up horribly wrong in the end, but M.E.M. is A LOT MORE tame compared to Bondage Game. As a personal warning, Bondage game might possibly give you future trauma, because of all abnormal experiments given. Protagonist in it doesn't give a shit about the mentality of the girls. M.E.M relies on experimenting sexual pleasure on a positive note. They don't do any harm that crosses the line, and stays in the realm of sexual pleasure. 

Probably the two most disturbing hentai I've found so far. These two will both leave an impact in some form after watching. I would classify these both as extreme hentai if there were a classification.  

Both hentais that have quite a lot of guro and are very hardcore. The characters are well animated, and the animes themselves are very detailed, so you'll need to have a strong stomach to watch either of these. The music is very similar too. Plus, they're both by the same company so you get the same sort of vibe from them both. 

I just think these 2 are very similar. Pain and indulgence. Recommend watching clips only. 

Both are hentai about a guy who holds girls in captivity. Both feature bondage, but Bondage Game is way more extreme. 

Bondage game and Euphoria are both, very dark and twisted tales of BDSM, torture and death. Neither is for the faint of heart. You just might be traumatized.  

The same disgusting thing with lots of rapes and a master-servant relations. Sex toys. Dark atmosphere. Bondage Game is a lot better, though. 

Both involve female genitalia being deformed and females with male genitaila. Though Bondage game is a little more hardcore. If you like one....your sure to like the other.  

This is far beyond Hentai, its like...FUBAR Hentai. FUBAR: Fucked Up Beyond All Recongnition  

Both have bondage, great art, big breasts, urination, physical abuse, master and servant. 

Both dark, both hardcore, both involving lots of slaves. Both contain lots of fetishes and bondage, and if you liked one, then the other is a must-see.