First off im just going to add that the end of this volume is where the anime stops with the letter in the last chapter. I wouldn't recommend just starting here if you just want to see what happens from where the anime left off, start from the beginning as there are some occurrences in the previous volumes that add more information that you'll need in the following chapters to fully understand what is happening.
This volume sees the climax of the potion scheme along with some more growing of abilities within the group, very interesting and enjoyable up to this point. Looking forward to new content in the next volume