Alright, so first, this continuation is titled ” 大魔王様の街づくり～魔法と科学と魔物が創る理想の街～” or ” The Great Demon Lord’s City Development ~The Ideal city Built with Magic, Science, and Monsters~”. Depending on the context, I might modify the translation.
The original, Japanese page for it can be found here
The table of contents will be this page. Warning: I translated the synopsis provided by Tsukiyo Rui-sensei, but I’d say it’s a bit spoilery. Maybe wait a couple or so more chapters before going to that page.