This review is based SOLELY on my own opinion/enjoyment of this short drama. I haven't read/watched either the manga or the anime.

What I liked:
-The special effects were good.
-I really liked the stylized outfits that the main characters wore. School uniforms with a twist?
-I liked the cinematic coloring. I don't know quite how to explain it, but the blue/gray hues used throughout, especially in the dark fight scenes, were effective.
-It was a short five episodes.

What let me down:
-Lack of character development. The focus in this drama was fighting "the big bad", and there was A LOT of fighting. Unfortunately, I felt that the characters took a back seat to the violence. As a result, I didn't feel too invested in what happened to any of the characters.
-Overacting. I think this may have been due to the fact that this was purposely comic book-like. Everything was exaggerated. The fighting, the facial expressions, the yelling, etc.

I think that if someone enjoys anime/manga, they would probably like this drama.