On (or around) January 17, trial reading of volume 7.5 will be released on these three official websites. You can read about 40 pages at the beginning of volume 7.5 for free. Of course, it's in Japanese but if you really want to know what happen in the volume even just the tiny bits, worth a go I would say. I will post the translation here though if we get any, will be spoilered in case others haven't yet to read this far.
Here's the links to the three official websites
Some of the released illustrations for volume 7.5
and here's the synopsis for volume 7.5 (don't click if you haven't yet to read this far)