Plot: The plot of story have of course interest me, because not many authors actually really dare to write about such hard subjects such as bullying, self harm. Your plot may be cliche, but you managed to add some of your own vibe into it. 

Grammar: I will be fairly honest here. English is not my first language and I fotenly make some minor mistakes while writing my own stories (nobody is perfect really). While reading your story. I haven't encountered any mistakes. Punctuation, wording and everything seems fine to me and it was easy for me to follow the story.

Style: You choose to write story in 'You' POV, and its okay, not many authors on here can't really manage to write. And the way you did it I like it very much. Even in this POV, you managed to be descriptive and to convey your story to readers. 

Characters: Your character potrayance is very good. You tried to develop every each of your character, and to add your own spice. I love how you add a little of your own twist in developing Kai's character. You did very good here. However, you need to focus more on developing relationship between main characters(couple). Since you told me that I need to focus on character flow, I will be honest: your characters do not have a flaw, while reading your story I couldn't find any flaw that would made me go 'Um'. So you did very well in this section. I love every your character, you made them totally realistic.

Flow and Pace: The flow and pace of the story are great, they are neither slow or fast, but very good. 

Overall Enjoyment: I enjoyed NO, I adored reading your story. I love to read nicely written angst story and you did just that. I read this story in just a day. And I can say that it was as if I was watching a movie. You made me cry totally. I wish you all best with your story and keep working on it.