If you start with a charm that supposedly brings good luck and offer to barter it with passersby on a bridge in Osaka Prefecture's Dotonbori district, what sort of trades will happen and people will you meet? For 3 days, we put this question to the test. The people who swapped items with us included a Frenchman who fell in love with Osaka and decided to live there, a women's soccer team visiting the city on a university graduation trip, and an elementary school student traveling with his father after participating in a national karate tournament. Through a series of trades, a connection gradually forms among strangers who otherwise would have no link with each other. When 72 hours are up, what has the "bringer of good luck" turned into?