(This is the 8th in the series, read the others first) The yearly festival celebrating the goddess Eris has come to. However, the Axis Cult wants to participate as well, resulting in a rivalry in the 2 cults. Kazuma is dragged in, and is stuck as the advisor, seeing over the festival.
This volume has the signature comedy that Konosuba is known for, and plenty of it. Just seeing everything unravel keeps me glued to the screen, for the hours and hours that it takes to complete.
Like most series with an episodic format, Konosuba may eventually get boring. The plot also isn't focused on all that often, as this series is mostly character-driven.
You don't have to be an advanced reader for this. However, it contains strong language and some suggestive themes, so don't read it if you're sensitive to those type of novels.