So I'm going to come out and say it, I really hope the tension picks up again with the next chapter. I've got my thoughts about the manga, but in general it started out much stronger and now it feels much more average. And it's not even due to the ultimate magicians. The problem is weak enemies. In terms of personality and mystery. Their power is strong sure, but honestly I could not care less about the enemies. The subplot with Shtrom and his bride (forgot her name, she barely appears anymore) was so interesting and now it looks like we're finally getting something. Hopefully, since that subplot and Shtrom were what made the demons so interesting.
But instead we got for the most part no real advancement in the plot beyond the allying of the nations. We only see what the other demons are planning and that they're strong. But they want to take over the world? They hate everyone? And they claim they are demons because they're inhuman, but when around each other they act exactly as their human selves in the past?
Shtrom really shows what it's like to become a demon because he became one in personality before becoming an actual one. But now he's been sidelined for so long and I don't feel like the other demons really keep up with him in terms of quality except the right hand captain.
Again, hopefully with the story of the demon that was defeated by Merlin and Melida we can glimpse into some of the mystery of the world again. I have more thoughts about the series and will keep reading. But it's getting to that breaking point where I might stop for a while and pick it up later after some chapters have gone by.