Seriously, watch the OP and find a few screenshots of the background art and you'll have soaked up most of the heat from this show without wasting your time.
Enen no Shouboutai as an anime is close to a best-case scenario for the adaptation of the source material manga-- there's smooth animation and entertainingly-expanded action scenes, brilliant coloring that complements character designs, and remarkably detailed background art. Sadly, the background art develops the intended sense of a ramshackle, retrograde, post-apocalyptic city-state far better than the stock characters yelling in the foreground. All of this extra effort by the anime team carries the original material, but only so far-- the palanquin is resplendent, but the dignitary on top is asleep. Once the flash of the first few fights are past, and the standard array of Shounen Fighting Show character classes have been ramified into fire-based flavors, there's nothing particularly fun going on here.
