At first I read, humans and demons. So I went meh. Then I read economics and Spice and Wolf and that got me suddenly interested. Then I saw "useless meat" being spammed across 2 pages and then facepalmed.
Seriously guys! You're not making sense! Action/Supernatural Shonen ---> Fantasy/Medieval ---> Fanservice is how I interpreted it.
Now can someone please give me a correct description?