Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ (Novel)

Beings that create and control monsters and demons, beings that build and reign over malicious labyrinths, the chosen individuals to possess an overwhelming Unique Skills. They are the Demon Lords.
Demon Lords entice people to come to the labyrinth they have built and eat the people′s despair as their nourishment.
However, Creation Demon Lord Procell has decided that he will obtain people′s hopes and not their despair as nourishment, and so he built a happy town instead of a malicious labyrinth to collect human beings.