When Monkey D. Luffy and his crew arrived on the island, Brief watched them from a distance and later got Luffy alone where he offered him to join the Mustache Pirates and defeat Omatsuri. Luffy declined, but Brief warned him about Omatsuri.
Later, he saved Luffy from being killed by Omatsuri. Brief explained the history of his crew to Luffy before the young captain ran off to be defeated yet again by Omatsuri. After strategizing, the two partnered up to distract and defeat Omatsuri, with the help of Papa and the Tearoom Pirates, the former of which who actually killed Lily Carnation. At the end of the movie, Brief acknowledged that he would remember Luffy and would look for a new crew, inspired by the young captain.
‡: the character is no longer part of this group. Hovering the symbol may give further details.
The only named member of the crew is the captain, Brief. Including him, each of the crew members had the same kind of mustache, but none of the others were ever seen except in a photo. Brief also has a pet goat. It is unknown whether the goat joined before or after the death of the rest of the crew.
Later, Brief asked Luffy to join his crew. Luffy declined, saying he had his own crew, but, at the end of the movie, acknowledged that he and Brief were friends by making the crew sign.