I don't tend to write reviews because I honestly couldn't be bothered and even when I do, I never write one for an on-going manga.
So... why write a review for Caste Heaven? Great Question!
The answer is quite simple in all honesty; I found the other reviews to be unsatisfying and quite frustrating (no offense).
Caste Heaven is a yaoi manga revolving around the hierarchy between the students of a certain high school that is decided by a some sort of "card hunt" that changes every certain amount of time.
I won't talk long about the art since it is amazing and absolutely breathtaking and I see no point in adding more adjectives to it...
The plot, while in it's core not the most unique one, is beautifully played and is very intelligent.
Now, for the most important thing I wrote this review for:
The characters are outstanding and completely enveloping the story as they are what brings it to a 10.
While it's true that this manga is really fucked up, dark and portrays unhealthy relationships extremely graphically that does not mean that the story is bad. You need to have the ability to know when something in front of you isn't healthy without the author straight out slapping it in your face.
Because the story is so dark and twisted and no one says otherwise inside of it, it forces you to be that much emotionally involved.
Each and every character is a work of art on their own. They are intelligent, strong or weak, go through some greatly done development and have very interesting personalities as well as backgrounds.
You get to know almost every character individually (which makes the story way more full and engrossing).
I could go on and on forever on this one so feel free to hit me up about it for more thoughts.
To sum things up, this story is a masterpiece and isn't for weak souls.