S-kyuu Party kara Tsuihou Sareta Karyuudo, Jitsuha Sekai Saikyou ~Shatei 9999 no Otoko, Teikoku no Sogekishu Toshite Musou Suru~ - Ch. 2.1

[Samhill]

Princess: "Since land is scarce, our buildings are built vertically."
The City: sitting in the middle of a vast, open field not being used for things like farming

I can already tell that I'll get more enjoyment from this series by looking at the pictures without reading the words. XD

There is also a vast, underground city full of skyscrapers.