Dungeon Builder: The Demon King's Labyrinth is a Modern City! Volume 3 features story by Rui Tsukiyo and art by Hideaki Yoshikawa.

Construction on Procel’s utopia is finally underway. But nothing seems to be going right for the young demon lord. Between negotiating with shrewd merchants, bestowing names on contracted monsters, and facing off against fellow demon lords, Procel has his hands full. Who knew building a city would be this difficult?