I watched the anime a few years before I decided to read the manga, since the anime never came back. At first, I thought it was because the anime didn't perform well so it was pointless to wait for another season but soon I came to realise that wasn't the case. The anime ends in a major cliffhanger, which usually means that revelations are to be made in the future.
5 years later I finally decided to see what that was all about and I couldn't be more frustrated. Since I didn't really remember anything about this show aside from the fact that the main character has a cursed child as his assistant with immense power and that they have to fight these monsters that threaten humanity, I decided to read it from the beginning. That was a mistake and also a good move. The anime doesn't end in a cliffhanger because they were expecting a 2nd season, it ends there because that's where the story ends. When I found out I was frustrated, not because The manga sucked, but because the story was good and interesting and for some reason ended up being canceled (at least that's what I think happened).
For those of you who want to read it, be aware that emptiness awaits you. As for me, I don't recommend this manga, although I liked reading it, it's not worth the time.
