I love mangas and I feel that they are better than anime in many ways, but it is easier to watch rather than read, obviously. I would say that the atmosphere in anime is better, but manga many times draw me in. Now why I said that.. it has been a really long time since a manga made me read nonstop from beginning to the end. It is so rare to find manga's and I started reading after a guy suggested it. But I literally started reading it today (Well kind of yesterday since it is 2am now that I am posting, but you know what I mean) and finished it. I am not sure how I could describe it... truthfully with this manga 1 picture can result with 1000 words. I highly suggest it to everyone, at least up to the point he starts seeing things.
A lot of scenes and moments are disturbing, so if you are a closed mind person I suggest to skip it. It would make you feel unpleasant a lot of times.
I do want to though point out something about the ending that will be a spoiler for anyone that will see it so... if you do not want to see it, don't. I just want to express about not expecting this.
I expected a better ending and I am not talking particularly about a happy ending. Actually with such a story I did not expect a happy ending at all. In the end he ends losing his mind after he finds his supposedly real self. The end was nice to be honest but felt quite unrewarding. Like you read a story of a man struggling to achieve something and as soon as he gets 1 step away from realizing his goal, he dies. (PS: The guy does not die).
It is a shame the ending felt so unrewarding (to me), but then again it was ok and an acceptable ending. I would by no means call this a bad ending.The ending though is the only reason it does not get a 10/10 since the ending of a story to me holds 70-80% of how much I will end up liking the story. But again, it is personal preference that makes me not like it.
I am really glad I found about this manga and read it!