Dragon Warrior: Oath of the Dark Moon

[The story initially followed the original plot, but the more I wrote, the further it drifted. Most of what comes later is original, with some characters and Dragon Battles left out, mainly because the protagonist doesn't have a partner dragon.]

An ordinary girl falls from the moon.

The Dark Moon Beast Dragon catches her and stays by her side from then on, protecting her like family.

She doesn't know why she came here, or who she is.

Then the Dragon Warriors appear, shattering her peaceful life. The Dark Moon Beast Dragon turns against everyone to protect her, and eventually falls before her eyes.

With her only source of support gone, darkness takes advantage of her vulnerability.

But when she finally remembers what the Dark Moon Beast Dragon said:

"I've been waiting for you all along."