1. Tone is all over the place. It's comedy, then tragedy, then action, then dramatic. It makes each of those scenes less impactful than they should be due to the tone constantly changing so quickly. I would have much preferred a consistent dark tone to the anime.
2. It's a shounen anime despite the concepts not fitting into a shounen anime. The power system, characters, and world just don't fit in a shounen anime. You have a normal world where people are seemingly born with negator powers that can end the world, but nobody knows about them...except a secret org made up of negators guided by a talking book? Make it make sense. In most shonens, the setting is in a fictional world so it's more easy to digest why things are the way they are. Not so in this case...
3. Additionally, the only growth I can see from the MCs is emotional and character growth. They are already at their peak power and their motivations are not to get stronger but to actually get rid of their powers completely. This does not bode well for a shounen-style plot, so I can't see this ending in a satisfactory manner.
Overall, I will finish off the season but the last few episodes have had really poor writing. I can't believe they dedicated so many emotional scenes to a teacher who has had 2 minutes of backstory. I was completely turned off by that.
edit: finished off the 1st season and it does explain a lot more of the world and origins of the powers. Overall, my rating doesn't change though. I think the action and pacing is better than most shonens, but in the scope of overall animes, there isn't anything special here. The characters are just not well-developed and I can't invest anything into them.
