As humanity expands into the stars, it discovers the universe is a hostile place. When Captain Slater of the USS Franklin is assigned to a deep-space reconnaissance mission, his ship is destroyed by an unknown alien race. Much to his surprise, Slater isn’t killed - he’s transformed. He is now a “derelict” - a consciousness bound to his old vessel.

She wanted to be a Necromancer, but awakened as a Saint! Somehow her summoned heroes are all undead? How will the church react when their Saintess summons a skeleton in place of a mighty hero? Sofia isn’t too keen on finding out. In this world, Gods choose [Saints], and [Saints] summon [Heroes] from other worlds; everyone knows that. But Sofia had a thing for bones ever since she was a child; there’s only one [Class] she wants: [Necromancer]! When, by the whims of fate, she gets both classes at the same time, the system breaks.

The usual result of a human taking a runaway semitruck head-on is a very sudden, very fast track to the pearly gates. But for one newly noncorporeal man, there's another option: become a dungeon. Feeling sorry for the desperate angel assigned to him, the man relents. Heck, if it doesn't work out, he can always chat with Saint Peter about it later. Next thing you know, he's a dungeon. Admittedly, a small run-down, somewhat unimpressive dungeon (more of a house, actually), but you gotta start somewhere, right?

When Kers is reborn as a dungeon core, he finds himself stuck in the most improbable of places: a cloud. High in the sky and far away from the usual solid resources, Kers must face the obvious question: How is a dungeon to build itself without wood or stone? Luckily, Kers has the sarcastic (and sometimes helpful) fairy Selena to help him get his bearings. Together, the pair delight in exploring Kers’ weird existence, creating novel mobs, and enticing adventures to plumb the lofty heights of his floors.

Leo wanted to make something out of himself—and build dams. However, the world doesn't want dams. And it mostly doesn't want civil engineers. It doesn't want men who do any sort of building or fighting or grand design, it seems. So, when Leo finds his current girlfriend and boss being threatened by a brutal loan shark and all three of them get dragged through a portal to another world, it doesn't take long for him to decide this is the place for him. Plus, everyone has magic, and who wouldn't want that?