It was somewhat the be expected, just like the second season the ''serious'' plot mostly ends here . I expect the following episodes to be light hearted fun and games just like the prior season was mostly fun and games.
I have to say Yukikaze was more ''boing boing'' than ever in this series plenty of attention drawn to it too, I guess they know what sells. Nanami also seems to have a bright future ahead of her, of course she's not quite the biggest character in this series but she certainly has a healthy offering to say the least.
As far as plot goes the episode is incredibly straightforward wasted little to no time on making this seem more intricate and deep than it really is. The awkward reporting for a serious battle aside we can see that nobody is risking their lives in this other than the heroes of course.
Demonking, heroking and Brioche don't get to do any fighting as their ridiculously powerful selves which isn't that baffling, albeit Brioche not showing up with Yukikaze was rather surprising but alas she shoes up with heroking and demonking.
Other than all three heroes and the dragonpriestress, all princesses get screentime, albeit only leon and milhi get a ''badass'' moment while Couverte only get's used as a (charismatic?) exposition device and some loli-service.
This episode really doesn't leave it to your imagination to what the specified chest sizes of the female cast are. Unsurprisingly Sharu our beloved dragonpriestress is very much slight in the chest area not at all far from being completely flat.
I made an album of it for research purposes:
http://imgur.com/a/apvy5
Reading back on my writing, the plot was very much top heavy albeit not equal in substance everywhere.