In Another World With My Smartphone: Volume 30 by Patora Fuyuhara

"After a long and arduous process, the plan to infiltrate the Ark is finally put into motion. With sacred treasure ready and Frame Gears strengthened, there’s only so much time left for Touya and the girls to make memories with their future children. Now that the rest of the great powers of the continent are aware of the gold crown on the enemy side, can Touya convince them that their Gold is an ally? And what is the true goal of the wicked devout’s gold crown? Could glasses be the key to saving the world? Find out in this tale of spectacles, decisive battles, and god-induced headaches!"