The first episode is a typical hot springs with a bit of fanservice and some piece of backstory concerning the White Dragon, Ki-Ja. Delving into the backstory of one of the dragons filled up something that I believe was missing from the Yona series, and makes them feel more fleshed out as characters. Especially seeing more of the Green dragon's actions in this particular episode made me enjoy the OVA, since he's my favorite of the four with the most compelling personality. Seeing how he handled the situation added some character depth. The misunderstanding present in the episode was humorous enough, and I enjoyed seeing the party interact with one another.
Especially the second and third episode provided a decent amount of backstory concerning the four dragons' origins and Zeno himself that's missing in the anime. The anime stopped at quite an unfortunate point in the story, and this makes up for a little bit of that, at least. So if you were interested in learning more about the original dragons and Zeno, I can really recommend these two episodes. It paints a much more dramatic and sad picture of such a cheerful character and I was surprised to see such a backstory for him.
In any case, these OVAs are a fitting bonus for those who have seen the anime.
