Well, to be completely honest, I found a meme, got curious as to what it was and it lead me to reading this story. I've had a few hints and sort of guessed what it was going to be like before delving into this story. I was correct, but it exceeded my expectations and just kept doing down and down and down.
I must say this story had a very good impact on me and my thoughts of actual people around the world. Leads me to say that you got to be careful in your decisions as one thing can lead to another and you'll never be able to go back on that.
Its a very hard manga to read and I wouldn't be surprised if you drop this manga very early. Its a good eye opener and you start to realise the bad in this world and that there always will be bad people.
You should definitely check this manga out, even though its a hentai, and hard to read through, it will certainly teach you a lot of things about how cruel life can be. It is probably the only hentai manga you should ever read.