One Piece: Open Upon the Great Sea! A Father's Huge, HUGE Dream!

Synopsis

The story begins aboard Pirate Zap's vessel, where crew members Bonnie and Max, exhausted and penniless, plot their escape. Overhearing their plight are three captive children. The eldest, Amanda, whose father was a professional treasure hunter, reveals the location of a massive fortune and proposes a bargain: if Bonnie and Max help them flee, the children will allow the pirates to claim all the treasure they desire. The five manage a narrow escape, landing on a small island where they encounter Luffy and his crew. However, the group is pursued, resulting in the capture of both Luffy and Amanda. They are taken before the leader of the Bayan Pirates, who is also hunting for the same prize. Now, Luffy and his nakama must fight against the Bayan Pirates to recover the treasure left by Amanda's father for his offspring. Through this ordeal, Amanda, who had long resented adventure and treasure hunting due to her father's constant absences, finally comes to understand his feelings.