Introduction: Ethan Shaw was just a struggling bookstore clerk—until he stepped through a mysterious door and became the owner of an interdimensional shop. Now, bound to a powerful shop management system, he must trade with adventurers, spirits, and gods from across the multiverse.From enchanted artifacts to futuristic technology, his store holds items beyond imagination. But every transaction comes with risks—powerful customers, hidden dangers, and secrets lurking within the shop itself.With no experience in magic or interdimensional business, Ethan must learn fast. Because in a world where every trade has a price, survival depends on mastering the art of the deal....