The Reformation of the World as Overseen by a Realist Demon King

is a Japanese light novel series written by Ryousuke Hata, with illustrations by Yuugen (Vol. 1-2) and Yuu Hitaki (Vol. 3+). The series began publication on January 17, 2019 by ASCII Media Works under their Dengeki no Shin Bungei publishing imprint.

The series was licensed and released in english by Yen Press.

Synopsis
By the will of a whimsical goddess, the seventy-second Demon King has been reincarnated to rule alongside a chaotic mixture of humans and heroes in another world. The newly minted Demon King Astaroth has been tasked with overseeing the reconstruction of this strange, new land, and as a realist, he will use rarely seen resourcefulness and tactics to reshape the fate of all who live under his reign!

(Source: Yen Press)

Manga Volumes
Manga adaptation of the light novel: with art by Manatsu Suzuki. It was serialized in Dengeki Maoh and released under the Dengeki Comics NEXT imprint from July 2019.
 * see: The Reformation of the World as Overseen by a Realist Demon King (Manga)