User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-5043481-20131105133938/@comment-3277384-20131107120128

@Dark Jinouga

In Gran Soren (a city of DD) there's a person called "Black Cat". If you give him an item he will duplicate it and then give both of them back to you (cause the original item + the duplicated one = two items) the next day. To duplicate you also need to pay.