Dungeon Builder: The Demon King's Labyrinth Is a Modern City! (Manga) Vol. 4

Biographical Note:
Rui Tsukiyo is a Japanese author best known for a number of fantasy light novels, including Dungeon Builder. Hideaki Yoshikawa is best known as the author and artist of The Other Side of Secret and the artist of the manga Dungeon Builder.

Publisher Marketing:
DIVIDE AND CONQUER? The war rages on! Outnumbered, Procel splits his main force and goes on the offensive...but will it be enough? A nightmarishly powerful monster awaits Quina and Rorono in the dungeon of the Demon Lord of Mucus. Meanwhile, a certain Ancient Elf is trapped in the labyrinth of the Demon Lord of Chaos...or is the Demon Lord trapped with her?