That has not much to do with the time he lived in that world. He grew up mainly as a commoner who obviously didn't know that since, like stated the panel you quoted, it's something classified. And when he got recruited by the royal family and got onto the airship, the topic of their secrecy didn't come up. Most people on there probably assumed everyone there would already know. That's hardly "beyond stupid".Author also seems to have forgotten MC has lived 15 years in this world... if MC still lacks the common sense of this world, he's beyond stupid.
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Akira choose this life because he only want a peaceful life with family warmth. That is why he have no desire to go outside of his hometown for FIVETEEN YEARS!Author also seems to have forgotten MC has lived 15 years in this world... if MC still lacks the common sense of this world, he's beyond stupid.
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An ignorant dude, yes. a dumbass? maybe.so the MC will forever be an ignorant dumbass, great, I guess the isekai part is just to sell, because the "he can draw manga!" is not enough of an excuse for this to be an isekai