Short Version:
Read it. But guaranteed it's probably going to make you wanna cry.

Not lemme elaborate:
Story: 10
This is because it's so amazing. The feelings it evokes- specifically the last couple of chapters. NO. It's too much. But not really too much. Because wow.
Art: 10
It's got beautiful art. No question.
Character:9
Not perfect because of one thing. The main character not being able to do one little thing. A simple function for most humans. But yeah. Other than that, decent characters.
Enjoyment: 8
Mostly because of that one character flaw and the fact that it ALWAYS MAKES ME FUCKING CRY.

So yeah. Overall that makes a 9. So READ IT.