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.

Synopsis
"I am a goddess. Hello, choose the devil Ashutaroto. Or better is good kana. I like more of Ashito" there was incarnated by whimsical goddess, and the chaos that 72 people of the devil is to reign, hero, human beings are mixed A different world. Astaroth, the novice demon king who was ordered to rebuild the world, spins a new page of legend that will be handed down here-armed with unique wisdom and strategy, a realist novice The Demon King hangs on an endless ideal-another world Demon King Hero Tan (Rebuilding Mythology)!

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: Realist Maou ni Yoru Seiiki Naki Isekai Kaikaku (Manga)