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?

In Another World with My Smartphone Novel Volume 5 was written by Patora Fuyuhara and features illustrations by Eiji Usatsuka.

The newly-crowned 16-year-old Grand Duke of Brunhild, Mochizuki Touya, is just starting to get the hang of managing a nation. What better way to christen his Duchy than to host a party with all the other royals in the region? Laughter! Fun! Pinball! But it's not all fun and games, Touya's search to uncover the truth behind the Phrase and Babylon bring him to the depths of the darkest forests, and the caps of the snowiest mountains. Not only that, but new territory means new responsibilities, and soon enough the eyes of the Vatican fall upon him. “Blasphemy!” they scream, “God is no old man, he is a magnificent being of light!” How will Touya react when even the Pope challenges the honor of the old man that gave him a new lease on life.

In Another World with My Smartphone Novel Volume 6 was written by Patora Fuyuhara and features illustrations by Eiji Usatsuka.

16-year-old Mochizuki Touya continues everyday life in his new world, well aware that it could all come tumbling down at any moment. He's the budding administrator of Babylon, the fledgling grand duke of Brunhild, and now he's a... mecha pilot? Desperate to find a way to halt the incoming Phrase onslaught, Touya makes a mad dash for the Hangar of Babylon, hoping it can give him the edge he needs. What he finds is the Frame Gear, an ancient humanoid fighting machine! Join Touya and his ever-growing band of wives as they tap into their mechanical sides.