Rheen knows how the stories go. You suffer an unfortunate death before your time, and a benevolent deity in the afterlife offers to make it up to you, reincarnating you in a fantasy world with fantastic, dominatingly powerful skills.

That's how it's supposed to go. But the reality is a little bit different...

Rheen doesn't even get a living body in his new world. He's stuck as the animating spirit of a dungeon he's commanded to administrate for the benefit (or perhaps just the sick entertainment) of the malevolent entity behind his reincarnation. Soon, Rheen realizes that no matter what commands he was given, his sympathies lie with the adventurers that explore his dungeon, and he starts his secret rebellion...