Mainly filler with some setup for future storylines at the end.
It focuses on all the main harem girls in turn, giving short exposition dumps, pretty much all of which is wasted since most of it was already known and the rest easily surmisable, especially considering the characters aren't that deep to begin with.
The comedy however was pretty good, at least the payoff at the end got me good despite me seeing it coming. If that part of the show tickles your fancy or you plan to continue watching the series, you'll probably want to find time for this.