The Library-City Dungeon

"I am a Dungeon Master. As yet I have no name. I haven't the faintest idea where I was born." So muses a brown-tabby library cat (yellowish-grey with black markings) who has completely blanked on the word "librarian."

Although it has been cast as the dungeon's Master, it can't be bothered to read the dungeon system's English, so it mistakes "Librarian" (the very title of the navigator it is supposed to summon) for the name of a racehorse. The upshot: for its very first dungeon monster, instead of a librarian guide, it just shrugs "Eh, good enough!" and forcibly summons Rosemary, a "secretary" of the Shiso (Perilla) race, one of the Six Realms, a plant-natured offshoot of the Asura.

From that fumbled first summon grows a sprawling library city, as a hapless cat Dungeon Master accidentally builds an agricultural empire one misunderstanding at a time.