In the same direction but with a bit humour thrown in and with 2 girls as characters: Girls Last Tour, where they drive on a Kettenkrad through the ruins of a a gigantic multilayered futuristic city with industrial complexes. They explore the last remnants of human civilisation, so also part future anthropology.

Now that I'm thinking about it, a few mangas have something like that, but only 2 more come to my mind right now:

• Dungeon Meshi (very strong world building in this one)
• Second half of BioMega (from same author as Blame, but not as good in my eyes)