Not much of a review, rather a correction to the one I saw already here, which is very misleading, I am sure not purposefully, though.
There are two "versions" of this manga, an one-shot, already reviewed, which is very tame, and normal... and the whole volume, to which the entry refers. It starts like the one-shot, but quickly descends into a very dark tale of drugs, abuse, orgies, etc. So be warned if you don't have the stomach for a very depressing tale stick to the one-shot.
Now if you are in for the ride, this is one of the best told tales, and narrated very well,
with sex not only being relevant to the story, but enhancing the emotional impact the events have.
The characters are also interesting, in the beginning they give the impression that they are paper-thin, like in almost all non-H and vanilla titles, but as the story progresses they gain a lot of depth.
Personally, I am not a fan of the artist's drawing style, but his work is consistent throughout the chapters. Also the design of the protagonist makes her "ordeal" look even more painful.