One Piece: Episode of Merry - Mou Hitori no Nakama no Monogatari

Synopsis

After Brook questions the origin of the Mini Merry name, Usopp and Chopper Tony Tony recall the adventures of the Straw Hat Crew's beloved ship, friend, and crew member—the Going Merry. Usopp abandons the crew for a fight over the Going Merry while Robin Nico leaves with the government's top assassin group, CP9. In order to bring the crew back together, Monkey D. Luffy and the remaining Straw Hats follow Robin to rescue her from the claws of the World Government.