Yona and the gang head to a hot spring, where some of Kija’s background is revealed after Jeha notices a scar on his back.
The first OVA is half standard hot springs fanservice episode and half serious flashback. It’s not directly connected to the second two.
After a drinking contest one night, Zeno finds himself dreaming of the past.
A two-episode flashback showing the beginnings of the Kouka kingdom and the details of Zeno’s history. There’s only a small amount of comic relief here with the rest consisting of reflective scenes and serious drama.
More Information:
aniDB
Wikipedia