If you're looking for manga similar to Juana and the Dragonewt's Seven Kingdoms, you might like these titles.
Three people cross paths, united by a flood and a dragon. A man who lost his village. An old man who lost his child. A young woman who lost her people.
Lufiak Duell is the member of a Dragon Clan, but in order to become a true member he has to find a dragon's scale, and he only has one year to do this. Along the way he meets a fairy named Feenie and finds an orb that contains the soul of the Master Dragon. When he meets the dragons they tell him that a plague known as the Dark Force has been released and is slowly infecting the world. Lufiak joins the dragons in their quest to stop the Dark Force.
The evil dragon who was the enemy of humans turns into a helper after several thousand years!? That was a story of the past, when magic was still a fundamental part of the world. At the end of a battle with the Hero, the strongest dragon was sealed along with his allies. The name of that dragon who ruled over vast races of magical beasts was Nielfeld. And several thousand years later—what he finds after the seal was broken by the descendant of the Hero, Patricia, was a world where magic had fallen out of use and science dominates! Introduced to the human society by Patricia, Nielfeld and his allies helps the humans out from the shadows!?
Some people live to work, others work to live. But Elma works to…eat! Elma is a Harmony Dragon who came to the human world to bring fellow dragon Tohru back home. In order to stay close to Tohru, Elma has taken a job as an office lady (OL). This charming new series from the world of Miss Kobayashi’s Dragon Maidfollows the 9-to-5 adventures of Elma as she learns to work and eat her way through the OL life. From mixed-up mixers to death marches, Elma learns that being an OL is just as hard as being a dragon…
An immensely powerful and ancient dragon, once worshipped as a god by humans but now only a myth in their eyes, wakes up one day to find a human girl poking around his lair. The infant is barely old enough to say her own name, but is quite confident in calling the dragon “Daddy”! Bewildered by the unexpected visitor, the dragon soon learns that returning her to human civilization isn’t going to be an option...not yet, anyway. He quickly decides to raise the girl himself, determined to give her a happy life that will lead her back to human society when she is older—surely a simple task for a legendary being such as himself. All he needs to do now is find a place for her to sleep. And figure out where he is going to get clothes for her. And...wait, what do humans eat again?