I like to judge a manga based on its ability to portray a dragon during combat.
Dragons should be portrayed with the same fear striking potential and potency as a thermonuclear weapon: Domineering, indomitable beasts that are bigger, stronger, faster, smarter, and entirely superior to every other cast. They've been described in history as nigh invincible godlike entities that can only eve be defeated through direct heavenly intervention; a sword forged to pierce a dragon's scales, an arrow twice the size of a man designed to pierce a dragon's heart, etc.
With all that in mind, I rate this dragon a 2 out of 10. Its intelligence is displayed at minimal animalistic values, with combat capability being mediocre, like a half trained boxer using a handful of tricks until they figure out how to actually string a combo. Its fear potency is nearly nonexistent. Both physical and magical power are both non-threatening (leaving only small cracks in soft dirt and entirely unable to break a simple magic buff), speed is just embarrassing, and it lacks every quality a nigh godlike entity should have; a cookie cutout dragon.
One could argue that dragons in this other world may be weaker than our fictional portrayal, but with two native girls, one with vivid combat experience, treating it with the kind of urgency you'd give a tsunami, it is unfortunate that it was displayed in such an underwhelming light. Why 2/10 instead of 1/10? Simpy because 1/10 is reserved for actual atrocities like Assassin de aru's dungeon dragon boss that only had its design going for it, or every dragon in that villiager becomes dragon god whatever piece of shit. At least this dragon was just generic.
This manga is still good, I'm just a critic of combat, especially with entities described in history to be prophets of the apocalypse itself. Manga is a 6.5-7/10 for being both a good time waster and mildly entertaining, dragon is a 2/10