After the Demon King was defeated, a "hidden dungeon" suddenly appeared in a remote town. It is infested with unimaginable monsters and an incredible treasure lies dormant! The newlywed Yui, who is attempting to conquer the dungeon, has a certain secret...!? A level 99 martial artist who saved the world has changed jobs to become a level 1 wife, but is forced to challenge a brutal dungeon! The unrivaled martial artist's newlywed dungeon strategy diary!