Konosuba: God's Blessing on This Wonderful World!, Vol. 4 (manga) (Konosuba (manga), 4)

After returning from their trip to Japan, Kazuma and the gang find themselves in a sticky situation! The metal monstrosity known as Destroyer is fast approaching, and if they don't do something quick, the town is done for! Kazuma takes the lead, Aqua prepares to disable the barriers protecting the behemoth, Megumin and Wiz get ready to unleash their magic, and Darkness is...just standing there? Explosions abound as the fight to save the town begins!