(Average+) A Herbivorous Dragon of 5,000 Years Gets Unfairly Villainized

NOTE: I watched this series in Chinese

Series in one sentence:
A fanged, clawed beast somehow evolved to enjoy grass.

Series in more sentences:
An old dragon is randomly deemed a powerful beast of legends, and when he meets a little girl willing to sacrifice herself to him with the goal of defeating the demon king, his peaceful life comes to an end as he's dragged along a dangerous adventure he's not built for by an overly eager child.

It was alright. It tried to get its point across in its short runtime, but with episodes of about 10 minutes long, you'll always end up sacrificing characters and plot.
I expected the blond boy to get a much bigger role, but after he's instructed to drag a rock through a city, he's never seen again. The sacrificial girl is shown to be a powerful being, but really, that's all they have to say about her. I'm not sure what I witnessed in those flashback scenes with her father.

She and the dragon started to annoy me after 3 or so episodes. Her whole deal is that she's easily offended for her "master", while the dragon shouts and whines all the time. He doesn't even care to keep up appearances for longer than half a millisecond, even though it's one of the first pieces of advice given to him.

The whole demon king quest sounds grandiose, but here, it felt really small-scale. I couldn't even discern if the ghost guy at the end was said demon king, but I don't think he was, meaning the anime ended without having completed the main objective or even bringing it up anymore. Maybe they intend on making a second season, which I'm not sure I'll check out.

Nevertheless, if you have nothing to do, this'll help you pass the time.