This story is alright so far. Only thing I don't like is how the MC seem to not really care that if the dragon eat him that it could be the end of humanity. He seem to cool with it as long as he got to live his life.
With that said. That mean he can't have children as she is going to eat them if they show the same abilities as him.
Other characters are just as clueless. Don't know how they can hear what the dragon said and be cool with it. That ability is the reason why a country got rated higher then others. And they are fine with a race that would eat them if it was easy to gain a ability that would make it easier.
My brain can't wrap the logic around this.
The only thig i can see is the MC cannot have kids, got to seal his body and hide it away, or kill that dragon.
I don't even know if the author is going to do that.
I think he can kill the dragon anytime. And why should he care if humanity will be won over?(I don't think they plan eradicate humanity maybe enslave) Like humanity's worst enemy is humanity itself. Our civilization most likely will destroyed not by external force but by the same humans.
He didn't agree to be a defender of humans nor did humans give him enough respect for him to shield humanity. Is it a hard logic to understand? Not everyone in our world strives to be "Hero" nor not everyone even dreams about this.
Same with nationalism, i think nationalism is countries free meat shield force. With the power of nationalism that was invented around 18-19 centuries people were ready to take up arms for free to defend "National values".
In reality in a lot of cases the only problem of other country taking over is the initial rape and pillaging (during war, sadly we cannot escape that even today) and after that if you have a different language then 1st and maybe 2nd generations will have a harder time until they adapt the language. (besides the language also religion and by that definition culture plays a major role)
FYI: If people are so good and ready to defend humanity, why don't i see majority of population doing volunteer work to improve their country? Why are there career criminals and scammers? I say as long as human doesn't harm another human he is already in a good guys league, not everyone has dreams to defend the humanity. I think actual amount of true defenders of humanity are very small. (same as those who strive to destroy it)