Three months have passed since Keigo “Kei” Yoshimura and Miyoshi started living the good life, but are their fortunes a gift or a loan? And if so, from whom? They may be on the path to finding out when the appearance of the Wandering Manor on the first floor of Yoyogi Dungeon leads to information about a missing person of interest. Meanwhile D-Powers, LLC, hosts a press conference set to shake the foundations of society. Kei gets his rock-paper-scissors game on. Will Kei and Miyoshi’s crafty capitalism save the world, or destroy it? All this, and dungeon cults too!

Hellhounds and archers await in Keigo and Miyoshi’s first foray into Yoyogi Dungeon’s lower levels. They may be traveling in their souped-up RV, but this is no vacation. Their mission? Obtain Otherworldly Language Comprehension, the elusive skill orb at the center of an international power struggle. Their plan? Use Kei’s dungeon ability, Making—which allows him to plan the next orb drop—and sell the orb to Japan for beaucoup bucks. Unless something stands in the way of their millions... When their plan hits a snag, what will the former researchers do? And are they prepared to face the unknown forces that will cross their path in the unknown depths of the dungeon? The duo is in for an exciting journey!

Hoping to steer clear of surveillance, Keigo and Miyoshi race to “retrieve” the skill orb at the center of an international power struggle: Otherworldly Language Comprehension. Pursued by teams from across the globe, the D-Powers duo battle their way through the undead hordes waiting on Yoyogi Dungeon’s tenth floor. While they’re experimenting with their powers, a mysterious gothic manor appears before their eyes. Haunted-house hijinks ensue as the pair are forced to navigate between international espionage, a floor of hungry monsters, and a group of guardians unhappy to have guests. But at least some new help is on the way!

Three years ago, dungeons suddenly appeared on Earth after an experiment in Area 51 went awry. Now everyone—from average citizens to soldiers—explores these monster-filled labyrinths in search of wealth, power, and magic. Keigo Yoshimura is an office worker with no sense of adventure, who dreams of quitting his job to live the easy life. While out on a business call, he stumbles on the birth of a new dungeon and accidentally gains a magical skill that turns subterranean exploration into an RPG. Things spiral out of control and Keigo winds up as the world’s top explorer. With help from Azusa Miyoshi, his mathematically gifted colleague and new business partner in dungeon diving, he might be able to turn the status screens he sees into piles of cash. Unfortunately, Keigo ends up under the scrutiny of the military, government agencies, and even more sinister forces. What happened to his dream of taking it easy?!

Having gotten their dungeon-diving legs, Kei and Miyoshi receive some special proposals. Both the Japanese Dungeon Association and an international mogul request for the two former company researchers to head into the dungeon depths to retrieve rare skill orbs! But can Kei and Miyoshi’s smarts help obtain a D-Card for someone unable to enter the dungeon on their own? They’d better hope so! A highly coveted table at a fancy restaurant is on the line! Plus, D-Powers finally come face-to-face with the United States’ top dungeon exploration team!

Enter the Phantom! Keigo and Miyoshi encounter new friends, new foes, and new financial woes. Following their momentous press conference and the announcement of their dungeon boot camp, D-Powers begins attracting attention from across the globe. To preserve Keigo’s anonymity, Miyoshi suggests donning a certain costume for some undercover explorer work. Plus, could one of D-Powers’ new recruits be a diamond in the rough? Does a heart of gold beat beneath Keigo’s aloof exterior? New discoveries regarding the dungeons’ mechanics and origins continue to pile up. Whoever this Phantom is, he won’t stop until his undead foes draw their last unbreath!

America and Japan prepare twin responses to a crisis in Yokohama Dungeon, with D-Powers and Team Simon caught in the middle. Plus, Keigo and Miyoshi prepare to go public with one of their greatest secrets. And a chance encounter answers all of their questions about the origin of the dungeons, and then some?! The clock is ticking. Get ready, get set, go research!