Osakana wa Ami no Naka is a very confusing manga and I'd recommend watching the anime adaption before reading the manga since it's kind of a "prequel".
Story - 6/10
The story is really confusing and I didn't know what happened most of the time, but even so it was fairly enjoyable.
Art - 7/10
I enjoy old manga a lot because the art got a different feeling to it, especially when it comes to yaoi and shõnen-ai. The characters have long and slim faces with sharp eyes, with an exception to the younger characters who have rounder and more child like eyes.
Character - 6/10
There were so many characters
introduced and it was really difficult to keep track of them all, it came to the point where I couldn't tell the difference between the main characters and the support characters. The relationship between the characters were also a bit difficult to make out, but what I could understand was that most of them were assholes.
Enjoyment - 6/10
Even if the manga was super confusing, then I did get some kind of enjoyment out of it. It's not the worst thing I've read.
Overall Score: 6