Pretty solid volume. I believe it starts with Latina dealing with the fallout from a previous volume, her "deal to become a demon" to extend Dale's life force (and unintentionally, his power, as now both a hero and a Demon-Lord retainer). Unfortunately for Latina, the other Demon-Lords are affected by her deal, so there is a need for erasure of this 8th demon lord. Of course, Dale isn't going to stand by.
It's a really sweeping chapter. A lot happens between the different nations and the demons that control them. It's unclear how this work will proceed going forward (maybe back to slice of life? Maybe kingdom building?). I kind of got the sense during the volume that we could be setting up for a tragedy, and I'm still not sure after having finished it if that isn't a possibility.
The only thing I didn't like was there were some plotholes that the writer just filled with excuses. Oh, you're not supposed to be able to ride a soaring wolf without magic... Well, these wolves have protective magic themselves / the riders are strong enough to handle the wind. There were other examples (well, one major one), but that would get into spoiler territory, so let's leave it there. The writer also had major info dump territories in this plot, which were super apparent reading the prepub since the final part was huge. I started listening to the last 3-4 parts about 3 hours ago and just finished, so yeah.