Dungeon Builder: The Demon King's Labyrinth is a Modern City! (Manga) Vol. 8

UNWAVERING DETERMINATION CHANGES THE COURSE OF WAR!A mastermind’s shadow looms overhead, and Procel intends to thwart any malicious plans! After saving Marco from near death, Procel swears to always be with her. As he enjoys a peaceful life for the first time in a long while, Stolas, the Demon Lord of Wind, faces her first war against a rookie demon lord. Unbeknownst to her, a trap awaits! When Procel attempts to join her battle, Stolas opposes: “This is my war and I’m going to win this on my own!”