Three years after monster-infested dungeons start appearing on Earth due to an American experiment gone awry, anonymous researcher Keigo Yoshimara strikes gold when he accidentally kills a creature. This earns him a magical “D-Card” and a mysterious skill that allows him to see RPG-style stats. Deciding to quit his job and go into dungeon diving, Keigo seeks the assistance of his highly knowledgeable colleague, Azusa Miyoshi, to help him conquer the dungeon exploration market and make millions. But it’s a face to obtain all the treasure and magic he can before the masses amount of government agencies and like-minded explorers take it first. No one said getting rich would be 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!

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!

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?!

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?!

In an age when the corners of the world have been scoured for their secrets, only one place remains unexplored--a massive cave system known as the Abyss, filled with monstrous creatures and lost relics. Those who delve into its depths are known as Cave Raiders. A young orphan named Riko dreams of following in her mother's footsteps as a Cave Raider, and when she meets a strange robot while exploring the Abyss, she is one perilous step closer to achieving her goal!