I can't say I devoted my full attention to this one, but I did get through it.
One thing that bothered me early in the reading was the way Haru treats gender roles. He sees women as damsels to an extent. When the idea crosses his mind of Yume switching to be the tank, he immediately thinks "this kind of role would be too terrifying for a lady". There were a few other parts that felt a bit misogynistic in the story, but that was the line that stood out. Some other uncomfortable sexual elements come up in this chapter too, so if that makes you a bit squeamish, you've been warned, though it never steps over the edge.
The new setting and its weaker enemies are detailed in full during the mid to late part of the book. It was interesting how the enemies operate on video game sort of terms, like them running away from high level oppenents, having multiple forms or attack techniques that are rigidly switched between.
The final battle is decently orchestrated, though the set up is really sudden, and not in a good surprise way, just kind of thrown in at the end. Overall the journey in this volume wasn't really that great, and our heroes are still scrubs that are getting very lucky. At least the book acknowledges this, Haru saying his group needs to improve their chances from maybe a generous 60% win chance to a 90% win chance.