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

Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ summary:

The one who creates and controls devils and demons, the one who builds and reigns over a dungeon of malice, an existence that was chosen to have an overwhelming unique skill— that is a Demon King.
The Demon King invites people into the dungeon that it created and, uses the despair it receives as nourishment.
But, Demon King of Creation Procell chose to use hope instead of despair as his nourishment, not a dungeon of malice but a dungeon of happiness, a town was built and lots of humans gathered.
However, the town he made is too attractive, and it will be marked down by other Demon Kings and also humans.
Without any other choice, he decided to use his unique skill and knowledge to form the strongest ultra-powerful demon corps, make an underground dungeon and set dangerous traps, and on top of that, make a wealthy city. Demon King Procell reigned showing kindness to those who supports him while being ruthless to whoever opposes him.
This story is about the two-faced eccentric Demon King.