Hunters are a special breed, dedicated to tracking down treasures, magical beasts, and even other people. But such pursuits require a license, and less than one in a hundred thousand can pass the grueling qualification exam. Those who do pass gain access to restricted areas, amazing stores of information, and the right to call themselves Hunters.

As the Phantom Troupe faces off against the rival Mafia families aboard the Whale Ship, Hisoka becomes the Hunter everyone is looking for. But where did the Phantom Troupe come from, anyway? Flash back to the group's founding and find out how this infamous gang of thieves got its start with a little help from the Mighty Sweepin' Power Cleaners.