The difficulty doesn’t really ramp up too much, except for the introduction of a Kansai-dialect character who appears in a few chapters. He’s the sole reason I’ve split chapter 9 into three weeks, rather than two. (Ah, I somehow messed up the reading schedule chapter numbers. I’ll fix that.)
Aside from that, some chapters do have more complex situations taking place, but nothing too much more difficult that the harder parts of volume 1.
If you survive volume 2, it’s coasting all the way from there.