After the Demon King was slain, the Hidden Dungeon suddenly appeared in a frontier town, said to be overrun by unimaginable monsters and to hold unbelievable treasures!! The newlywed Yui, about to attempt the dungeon, carries a certain secret…!? The Level 99 martial artist who saved the world changes jobs to a Level 1 housewife, only to be dragged into tackling a brutal dungeon!!