There are three episodes in the OVA and they mainly cover the backstories of Ki-ja the hakuryuu(white dragon) and zeno the yellow dragon.

The first episode shows the activities of the group in a hot spring in the middle of the mountains and also shows the reason behind the many scars on Ki-ja's back.This is adapted from the 12th volume known as "On that back" and "Ki-ja".
The second and third episode cover zenos backstory and give us a glimpse of King hiryuu and how Hiryuu castle came to be. Zenos powers are also revealed in these episodes. They are a summary of the 21st and 22nd volumes of the manga and cover the zeno arc.
King hiryuu and the four dragons

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