She Is a Master of Metaphysics and Can Only Survive on Credit.

Ling Yue guards a hardware store that is about to close down, and works as a "special" cleaner by the way - lending you a knife to ward off evil, predicting disaster, and then charging a price that no one can guess when it comes true. The knife has been borrowed, and the cause and effect are difficult to determine—this time, the price she wants to charge may be to overturn the huge conspiracy that lurks in the shadow of the city!