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!

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!

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!

The dust has settled around the Otherworldly Language Translation auction. Yet not long afterwards, Naruse shocked D-Powers with her translations. To confirm the existence of mineral drops, Keigo and Miyoshi must delve to an even deeper level of Yoyogi Dungeon. However, the enemy lying in wait might finally put Keigo’s stats and skills to the test. Meanwhile, the publication date for Heaven’s Leaks is drawing closer. While D-Powers counts down the days, they must also confront problems regarding their stat-measuring device. How will the world react to telepathy and the quantification of human abilities? Could these two revelations somehow collide? Finally, an old friend visits, but she brings news about Altum Foraminis. The healing cult has begun closing in on D-Powers. Regardless, the world’s top explorer, his genius sidekick, and their loyal hellhounds won’t be foiled so easily. Not until they’ve uncovered the secrets of the dungeons and sampled all the best food in Tokyo, at least.

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?!

Keigo and Miyoshi debut their orb auction and take in...how much?! But their orbs attract more than just bids. Just as the team looks to expand their business, the eyes of agencies around the world are firmly on D-Powers, thrusting them deeper into political intrigue. And if that wasn’t enough, the Japan Dungeon Association contacts Keigo and Miyoshi for help involving a secret Russian report, since their ability to “procure” orbs on command could be the key. When exactly is the R&R supposed to begin?!

After D-Powers shocked the world by auctioning off skill orbs—the most precious and ephemeral of items—the JDA tasked Keigo and Miyoshi with finding the Otherworldly Language Comprehension orb. This rare item could spark wars between nations in the wrong hands, but it could also make D-Powers obscenely wealthy. To find it, Keigo and Miyoshi must delve deeper into Yoyogi Dungeon than ever before, facing new dangers, testing out their many skills, and learning what it truly means to be an explorer along the way! Back on the surface, government agencies across the world are also starting to move—some hoping to aid D-Powers, while others seek to thwart them. This time, Keigo will have to face enemies far more dangerous than slimes, goblins, or even undead monsters...all in a day’s work for the world’s laziest top-ranked explorer!