You Have to Be Kidding: Why Is This Demon Sword a Little Girl?

[Everyday Life at the Fore, Leveling Up in the Background] My name is Lu Qi. I'm a veteran apprentice mage, experienced enough to trounce kindergarteners and kick the butt of the folks at the old folks' home. I'm invincible. I get the princely sum of two or three thousand yuan in pocket money every month, and my life is going splendidly. I do whatever I want, whenever I want. Until... “Little ancestor, this really is all the food I've got left.” Lu Qi is on the verge of a breakdown. Behind two stacks of instant noodle cups piled half as high as a person, a white-haired little girl looks up at him with a pout. “Hungry!” “I can't do anything if you're hungry. I gave you everything.” “Hungry!!” “There really isn't any more!” “Hungry!!!” “Arrrgh!” You're telling me this thing is a magic sword? Isn't it a money-devouring beast? Heavens above! My carefree life! My paycheck! T﹏T And my instant noodles! T﹏T