Warning possible Spoilers
Usually OVA's for me are important if they provide more for the story or they provide some extended fanservice for us viewers this is pretty much the latter, but for what it was it is actually still just as fun and hilarious as the main series.
The OVA is split into two episode's one concentrates on the girls going to the gym so they can get fit after the results of their latest body exam's while the second episode concentrates on Rachnera and her previous caretaker family as they try to get her back while also providing us with a steamy bra try on
Now OVA's would usually give us more fanservice like a beach or spa cliche episode surprisingly this decides to give us something a little different than what we usually see and that is a gym and a bra try on session and I've seen a good amount of harems yet I haven't seen something like this which gives the genre a little bit of fresh air from the usual cliches we see, It was actually interesting seeing the girls using the gym since we don't really know what activities they do to keep themselves healthy although the gym they're at is a prototype so not everything has been designed for every species yet and we get to see their competitive side again well for some of them while most of them just laid about getting a tan.
The second episode gave us something a bit more interesting which is Rachnera's previous caretaker family and it provides us a little more backstory on why they sold her to that creepy dude, even though we get to see just the families daughter you could see the difference between the daughter and Kimihito as both see this kind of thing differently and then the bra try on session just felt like good ol fanservice for us male and possible female viewers.
There isn't really much character development other than what we usually see except from a few new characters being introduced.
The girls just do their usual stuff like getting in trouble or causing trouble for Kimihito however he isn't in the OVA's much as it mainly concentrates on the girls although we do get to see a bit more backstory for Rachnera and why she became detached from humans because of the accident that happened with her previous caretaker family, but you can also see that when that families daughter came over to see Rachnera the girls were trying they best to try and sway her away which does show they do care about Rachnera.
The two new characters are Polt a random character that we have seen from time to time in the main series and Rachnera's previous caretaker families daughter.
Polt is actually a very positive person and is trying her best to create a gym for demi-humans and ask's the girls to help out to see if it is up to snuff though not everything supports every demi-human type.
The artstyle is just as good as the main series though this felt like it was trying to show off certain things like the usual bikini's and bra's you see female characters wear in every Ecchi anime though this felt like it was really going for it with the different styles especially during the bra try on session.
The fanservice was just as powerful as it was in the main series, hell it opened with bare breasts then again so did the main series so it shouldn't surprise me although when you're staring at a dark screen and suddenly see a breast come out of nowhere I'm going to be surprised, at least the girls looked great in the various bikini's and bra's they tried on.
The comedy was just as good as the main series as the girls continue to fight for Kimihito's attention especially during the first OVA where Miia, Meroune and Centorea had a swimming competition to see who was fastest and would end up being able to do one thing with Kimihito I will admit the outcome was surprising and then the bra try on session did have the girls arguing about who looked better in what which turned into a massacre when Miia got really pissed off and started tying everyone up in leg stockings.
Overall this was a pretty good OVA that gave us a bit more of our favourite monster girls doing what they do best, hopefully there'll be a season 2 because Kimihito isn't going to be able to avoid the whole marriage situation forever.