As an OVA, it's part of the Kure-nai franchise which includes the original light novels, a manga, and a 12-episode TV series.
These 2 episodes cover some day-to-day life of the high-schooler Kurenai Shinkurou. He's a dispute negotiator who is trained to use strong-arm tactics when necessary. And he's surrounded by women (of all ages) who make his life interesting.
Ideally, this is for people already familiar with the Kure-nai story. But if you're not familiar with it, you could try it out to see if you want to try the series, since it's pretty typical of content in the
longer series. (Though it has more harem, and less action/thriller.)
Here, Shinkurou runs into terrorists, has his usual after-school chore of looking for side jobs, and has to deal with the girls who want his attention: whether the lady-like little Murasaki that he's caring for, or her katana-wielding bodyguard, his profligate neighbors, or girls from school.
Supposedly these 2 episodes follow the original novel more closely than the series did, but they're so short that probably nobody would notice. More noticeable is the art style. It's much sharper than the slightly rounded style in the series.
Overall, it's a short supplement to the series that you should enjoy if you liked the series. And it's short enough that if you don't enjoy it, it won't waste much of your time.
I then watched the OVAs, thinking they would be similar, but they were completely different. The characters mostly have similar but noticeably different designs and similar but noticeably different personalities, with thee exceptions being that some have completely different personalities to the point of being unrecognizable at first, such as Lin. On top of that, there is a new character Kirihiko that just fits in with the rest of the group. Furthermore, the tone, atmosphere, style, etc. are all different being much more light hearted, wherein the main series felt rather dark. They also had a very different structure, focusing on random adventures with Murasaki
and other side characters, with the side characters also getting some decent development. All in all, I liked these OVA's better than the main series, since they were focused on what the best part of the main series was but with a tone, atmosphere, and structure that better fit it. And as far as I understand it, these are closer to the manga/LN, so I suppose I have something to look forward to in that regard.
tl;dr: A work that while based on the same source material, is pretty different, and that benefits from being so.