Mondaiji-tachi ga Isekai kara Kuru Sou desu yo?: Onsen Manyuuki

I am writing this review because I don't think the other two reviews fully justify the whole point of this episode. Now this is my first review so I hope it doesn't go too badly.

I'm not asking you to revere this episode for its plot and character progression, but I'm asking you to just enjoy it for its comedic value and lightheartedness, especially in the moments where the OVA satirized some anime tropes.

Besides, this is an OVA released after the ending of the first season of Mondaiji. Meaning we aren't going to get some epic fight that would pursue the plot of helping the ... No Name community regain its prosperity. The title even has "おんせん" (hot spring) in it so expect some light comedy and fan service.

The primary point of this episode is to show that life moves on (in the event that a second season wouldn't be created) and it has successfully done so in my eyes.

The OVA is a nice little ending to the first season.
As with most OVA the point isn't for it to have a big plot or follow on from/lead to anything, it's simply for comedy and enjoyment. To put a light ending on the following season.

It did it's job. The OVA is funny and enjoyable to watch. You get the quirks from each character and get to enjoy little things about them and events that are happening.
With some of it you wonder how there's not Ecchi in the genre, because it should definitely be there.

Overall it's worth watching to top of the first season, it's just ... one episode so it's not much, but it's enough to enjoy.

Considering how much I personally enjoyed the main series itself, when I heard about this OVA, I was looking forward to it. I expected to see the cast solving a gift game with the same suspenseful, yet somehow comedic feel of the main series. Instead, I was met with a HUGE amount of fan-service that seemed to be the main focus of the episode. I mean, I expected at least one battle scene.

Story: (3)
Comparing the story and plot of this episode to the main series makes me cringe. While the main series had an objective and reasonable plot devices, this lacks it all.
The ... OVA is filled with absurdly perverted scenes that seem out of place and irrational, along with stock "bad guys" for the introduction. Those "bad guys" don't even end up playing a significant part in the rest of the episode, and their only purpose seems to be to show off the ability of the main cast.

If you were to watch five minutes of the middle portion, it would be nearly impossible to guess what the main characters' objectives are, considering that the episode was filled with almost nothing but fanservice.

Art: (6)
Although the close-up looks of the characters seems to be the same quality as always, static images and re-used frames are easy to notice. The voices are not synced with the mouths as they were during the main series, and the stock villains during the beginning look absolutely terrible. The producers would have fared better if they used dark silhouettes. I'm not sure if this was due to budget problems, but it seems so.

Sound: (9)
Thankfully, the sound quality hasn't changed from the main series, and You's character song can be heard in the background during one portion. It may have been the first time I've heard it in a Mondaiji episode, but it really fit the mood and tone of the situation quite well.

Character: (8)
The new characters in the OVA are forgettable, at best. The characterization of the others is done quite well, and the focus is shifted off of Izayoi for once. You's mischievous nature is highlighted, as well as her insatiable appetite, and Ayesha can be seen to be more competitive, but in a less obnoxious way. The other characters don't get too much characterization opportunities, but this is fine, considering the amount of attention they received during the main series.

Enjoyment: (4)
Let me just say this now. I HATE fanservice. It detracts from the main story, and in this episode, the producers seemed to say, "Hey, you know what the main series didn't have? Fanservice. Let's try and fill an entire series' worth of it in this episode then."
Regardless of the fanservice in this episode, some parts were still quite enjoyable, like the characterization moments. It was a lot of fun finding out more things about their personalities, and also watching them clear the games with each other. It would be a lot more enjoyable without the fanservice, but hey, that's just me.

Overall: (6)
The OVA doesn't do justice to the main series. The only reason the OVA didn't get a worse score is because of the things is could get from the main series, like the OP, ED, and most of the characters. Everything else, including the story and art, seems to be much lower quality.