Dungeon Builder: The Demon King's Labyrinth is a Modern City! Volume 5 features story by Rui Tsukiyo and art by Hideaki Yoshikawa.

Procel’s dungeon utopia is threatened by the greed of their neighbors, but it’s up to Wight to defend them. Whether he’s up against a human or a demon lord, he must use all of his tactical skills to defend the peace of their dungeon. But fierce battles bring with them bitter losses—will the price of this dungeon war be worth it in the end?