One of those Anime, that leaves you a feeling inside when you have completely seen it (God it's an awesome feeling), well that's at least what i thought. When you watch Kuroshitsuji II you kinda need to remember what happened in the first season otherwise you can't really understand whats going on. After the ending song some episodes have a 2 minute clip(not every episode i think it was the first 6 episodes), that connects the story to the next episode, so be sure to see it, because at first i couldn't understand what happened between the first and second episode. I don't know what happened in themanga but it was a very good anime, hope you like it too