In Another World with My Smartphone Novel Volume 4 was written by Patora Fuyuhara and features illustrations by Eiji Usatsuka.

16-year-old Mochizuki Touya marches across the blazing desert sands toward the Burning Kingdom of Sandora. His goal? The Second Babylon. But once again, his journey is not so simple. The land is fraught with danger, and the cryptic words of an ancient doctor echo in the back of his mind. The Phrase rear their ugly heads, the dimensional boundary of the world begins to strain, and the mysterious monochrome boy, Ende, appears once more to puzzle Touya and friends. To make matters worse, a government starts to crumble, falling on the cusp of a military coup! Can Touya and his ever-growing band of adventurers stand against the combined forces of chaotic fate? Or will he finally meet his match?