I was afraid to watch the anime because I heard this was a bad adaptation, and after watching it, I can see why. The anime, imo, did the manga little to no justice, and if you're at all interested in this series, I highly recommend reading the manga.
The anime changed the series the events occurred in and never fleshed the characters the way it is in the manga. This could be due to the anime trying to adapt an unfinished manga, which deserves more than 12 episodes to be adapted properly, but even then, I feel that this could have been adapted better.
The worst part of this, imo, is the ending. It was just thrown together because the fate of the two characters in question have not been revealed. The anime tried to create a concluding end, and that makes me believe that we will not be getting a season two. Honestly though, I don't even want a season two, because if we did get a season two, it would be an entirely new series since stuff that happened in the anime completely alters the plot and some characters in the manga. If anything, a completely new adaptation is needed.
An anime I can liken to this is Akame ga Kiru. The manga was adapted before it was even completed, and because of this, the fate of a handful of characters was completely different. It takes away from the experience after dedicating time to reading the manga, and it was just a huge disappointment.
I can only hope that when the manga concludes, we will get a proper adaptation. The characters develop a lot more, and the plot is deeper (in some aspects), and this was all thrown away in this adaptation.
I guess I can say that the anime was entertaining enough. The art and animation was good enough for me to not be driven away by it, so I enjoyed that. Something manga readers look forward to is the series you are reading get animated on screen, and that was the elation I felt when seeing the characters come to life with voices and colors. I still am disappointed in the adaptation overall, but I enjoyed seeing these characters on screen.
