Title: 8/10
It's a very pretty title, the word monochrome is always a nice word to use. It kind of makes me think of a movie, one of those romance ones they used to make. It is a little cliche though, because I think I can guess that it will give away some of your plot. However! So far I cannot see how this title ties in. That is the hard thing of reviewing a story that is incomplete, and in this case, it's extremely difficult because you only have one chapter. I am sure you will have reasons for this name later on and so I will rate you for the benefit of the doubt, because right now there is no reason I can see.

Plot: 17/35

                2/5: Originality
                Well the idea of the world being black and white is pretty original, but I really don't see how that even matters in the world you're building. The plot of having a blind lead character is done a lot, and the whole 'ex-communication from parents' is done even more, and so except for the monochrome bit, this is a very cliche story. I hope that you have some twists planned, especially a reason for the black and white world, things that will make your story more unique.

                5/10: Believability
                First off I have to ask a question. Why is the story about a blind character in a black and white world? That makes no sense unless you will be writing from a different character's POV at some point. Otherwise, why would it matter to the reader or to the character that the world is black and white?
                Also, I would like to point something out. Blind people cannot see, but they DO have movement in their eyes. So he could roll his eyes, quite easily. They can also cry. So unless his eyes were removed, this part is completely irrational.
                The sister dying from hitting her head is also strange. I hope that you do add more explanation to this because the only way that someone would bleed out from that is if no one was around to provide a compress to the wound. He was there, since his parents blame him, so why didn't he add a compress? A little explanation here would go a long way with making your story feel more believable.

                7/10: Narration and 3/10: Setting
                I have to admit, I am not a fan of first person POV because it does not do a very good job of telling the story as it is. You cannot paint the physical picture of the world very well while using a first person writing choice, because everything that you show is shown through your character's eyes and thoughts. In this case, since your lead character is blind, that means the reader barely gets any setting whatsoever. 
                Also, the first person P