This review is coming from someone who read and loved the manga, and was hoping to see it translated at least decently into an anime.
In my humble opinion, this anime was awful. Just dreadful. It completely messed with the plot of the manga, changed up time lines, and over-all made the series seem like a joke.
I saw depth in the manga. The manga made me feel anything from laughing out loud to anger to sadness. The anime made me feel embarrassed to be watching it.
If you want to see a manga translated respectfully into an anime, this is NOT the one to choose.