@dokidoki
To be clear, because you said "ch 72", chapter 26 ends with release 72. A release is 2-5 pages, usually 4, to fit within twitter's image limit. A chapter is, generally speaking, especially in later volume work, 3 releases, so about 12 pages. It is possible to know the breakdown of a chapter by looking at the comic-walker (or niconico) version of the series, which is posted soon after every set of three releases that make up a chapter. This is also a way for you to see a version closer to what the volume will look like, before buying the volume. They do take down chapters after a while though. So if we're at release 101, what chapter are we at now in the raws? Chapter 35.