Finally we get Teacher's story and purpose, alas another victim of Truck-kun. While the information we gain is interesting, and, to be honest, a bit late, the volume itself was a bit heavy on the exposition with a few low-stake random fights added in for the action. I enjoyed the read well enough, but it is not the strongest in the series.
It feels shorter than the others in the series. Didn’t check but something like a 90 minute read? We have a bunch of info-dumping mixed with training montage but very little of substance here. I dare say you might even be able to skip this volume and go onto the next book.