I see. The world building is way more complicated than, "suddenly, dungeons." But if the world was crazy like this from the beginning, why is the world shocking similar to ours in terms of aesthetics and culture. I think this needed a slightly more fantastical style for clothes, architecture, customs etc. Just to reflect the fact that magic and demons and stuff have been totally real and impactful for thousands of years. Still urban and industrialized, but with more fantasy tropes modernized.