I really need to explain some stuff before so here it goes:
First things first. I hate Misaki, i don't like her not even in the Manga where she was more of an adult. I haven't read the book and...
[spoiler]The suicide scene wasn't pictured in the obvious way like in the anime.[/spoiler]
I really feel that the manga detailed a lot more about their relationship (which i don't really care honestly) so the anime adapts better my favorite parts.
My opinion is based in character liking, i don't really have a preference about a slow or a fast show as long as you get to understand the whole thing.