Small brain readers, beware. The Manga gets too technical MOST OF THE TIME. The topic sometimes delves into scientific fields, programming, even as far as unraveling fictional concepts using scientific methods. Just the wall of texts and the dialogues would bore anyone who can't sit through a meeting just as much. Enough with that, the manga did a good job in making/designing their characters. Their personality is solid but flaws are still there making them feel alive. The world setting is also fleshed out; the world is on their road to exploring everything new that the world is opening slowly but steadily unlike other modern fantasy whereeverything just, suddenly works.
The human conflict is well crafted, wholly reasonable. The tension between nations are also palpable, to the point that you feel like it will definitely happen irl if the world is similar to the manga's story.

Tl;dr, the manga is basically about exploring fantasy elements technically with solid characters and a superb world building.