Okay, so this is the first review I have ever writen. This anime fucked with my mind, I hate how well the main character was able to be expressed. (TW: Spoilers?) In the begining we were made to pity this character which made us justify his actions, his morals are of a perfect worlds. A give and take. You do thsi to me, therefore I do this to you, you kill my friend I do the same amount of harm to you. He clearly has his screws loose and i'm tottally here to see what crazy shit he pulls off. I personaly like just how twisted he is. Well this is also a borderline Hentai with a lot more plot. This is the type of anime that is either quite liked or hated there isn't an inbetween and both are fine. Either way, I'm never watching it again, but I don't regret watching it either.
(Keep in mind, this is only one person's opinion, you should judge this by your own standards and come to your own conclusion. Have a nice remainder of your day)