Oretachi no Maou wa Korekara da.

Oretachi no Maou wa Korekara da. (俺たちの魔王はこれからだ.) is a web novel written by Midori Yuuma on the site Shoutsetsuka ni Narou under the name Kappa Doumei. The first chapter was published on April 25, 2012 and the final chapter was released on January 15, 2016. Two volumes were published by Kadokawa under the Fujimi Fantasia Bunko imprint with illustrations by Ruroo. It serves as the original concept for Tales of Reincarnations in Maydare and the two versions share characters, terms, and concepts.