Rim is a ferocious dragon that often takes the appearance of a little girl. Ninomiya Kinji meets her when he's in the Detomold Mine Ruins. At first Rim tried to eat him but in the exchange of a promise for tasty food, she ends up helping Kinji out. She has a voracious appetite. She originally looked like a huge dragon, but after joining Kinji, she transformed into a human girl with pink hair, horns and reptile scales on her limbs. She gets hungry as soon as she does something

The Dungeon of the Black Company
Kinji, who lacks any kind of work ethic, is a layabout in his modern life. One day, he finds himself transported to another world—but not in a grand fantasy of a hero welcomed with open arms. He's immediately shoved into a terrible job! Now enslaved by an evil mining company in a fantasy world, Kinji's about to really learn the meaning of hard work! [Seven Seas]