If you came here after reading Psyren, turn back and just read that again.
If you didn't come here from Psyren, go read that instead.

Now I'm not saying that Kagamigami is bad, it's definitely not, but it ultimately falls short of what I think it should've been able to achieve, especially based on the author and the concept. In a nutshell, I think that Kagamigami has an excellent premise and setting that wasn't given the care and attention it needed to be something really great.

For a quick tldr, this manga is primarily about finding and stopping a terrorist group, with a secondary plotline about the power struggle between a cast of major families, all of this taking place in a world where youkai (spirits, demons, etc.) are real and we have the loose of equivalent of shamans (think Shaman King) doing battle with them.

For the first 20 or so chapters, the terrorist plot line is the main focus and it's done very well. The pacing is good and the mystery unfolds at a solid pace. Character introductions are handled pretty well and the main characters have a fairly strong dynamic. 8/10

The next 10 or so chapters brings the major families into play and we get some nice insight into the underlying structure of the world. This is also good. 8/10

Then you realise there's only 10 chapters left and it's all downhill from here. I won't say how it goes downhill (and in fairness it's not a terrible ending) but I cannot pretend that it didn't. The ending was rushed, mediocrely explained and ultimately didn't make good use of where the story could have gone. 5/10

Kagamigami could've been a strong 8 to weak 9. All the pieces were there, the direction of the manga was on track and I know the author has the skill to take us there. So I'm disappointed that it ended up being as mediocre as it did at the end, and I'm sad that the great manga it could've been simply doesn't exist.

If you're a fan of Psyren, or Shaman King, or just the shonen battle genre in general then I would still recommend Kagamigami. I would just ask that you keep your expectations in check and just enjoy ride.

Or just go read Psyren.