In a world of swords and magic, this is the story of a merchant with zero combat power who grows in areas other than physical strength. The protagonist, equipped with the common skill 'Warehouse,' spends 15 years as a bag carrier in a party led by the strongest hero, Ryan. After the party successfully defeats the Demon King, the protagonist is dismissed. At 30, he is cast out with only a small amount of capital. Determined to rise and become a great merchant, he also plans to find a wife. In this world, polygamy is acceptable.