SPOILERS AHEAD: I have waaayyy mixed emotions about this. The manga trapped me fast and I spent countless nights reading it. I loved the character development at the beginning and how you just had to learn about the protagonist at the same time as she was learning about herself. The mangaka has a great talent and perseverance and how her style improves. But I hate the end. It's just... weird. We can all have different opinions of course, but HER BROTHER??!!!??!! OUT OF ALL THE PEOPLE???? It looked more like obsession than love. And Kai didn't deserve all that. He cherished her and helped her go through all that new confusion while giving her time and space. Now i'll be pissed off for my entire life.
Afer finishing it, I could see how it was clear where the story was about to go. Maybe I just hoped for a Shoujo-cliché-ish type of story, but I see now its more of a Josei.