Holy hell! What else can you say when such an incredible volume follows so closely from the painfully mediocre books 10-13 (though to be fair, volume 14 was pretty good too)? I swear, the series hasn't been this good since books 6 and 7, and this one might actually be better than them.
Based Kazuma takes on a thot priestess and her cult of simps. For the first time in the series, he is unable to rely on his party members for help. So he fights her using exactly the kind of hilariously underhanded gorilla tactics you'd expect, and ends up making her life hell in what are by far some of the funniest scenes in the entire series.
But then that story ends, and we begin what is really the first Aqua-centered plot since book 4 (for whatever reason, her volumes tend to revolve more around a normally secondary character like Eris or Wiz). We get some touching scenes between her and Kazuma, and it's great to be reminded that, beneath all their bickering, these are actually two close friends who care very deeply about each other.
On top of that, not only does the plot of this book follow on directly from the previous one, but it also leads directly into the next one, meaning we can finally stop feeling as if the series is just dragging its feet.
Bonus- there's also a moment where Megumin basically proves that she, and she alone would be willing to take care of Kazuma if he lost his mind. Demonstrating once and for all that she is best girl.