The special will revisit the childhood past of the three sworn brothers Luffy, Ace, and Sabo, when they all dreamed of becoming pirates. In addition, it will depict how Sabo originally came into the kingdom of Dressrosa (which was not depicted in Eiichiro Oda’s original manga or the television anime), as well as his reunion with Luffy from his point of view.
《航海王》的特別篇動畫系列是以人氣橋段或者角色為焦點所製作,本次推出的動畫將以魯夫、艾斯、薩波三人為中心展開,除了描繪三人童年的故事外,還會加入原作漫畫與電視動畫都未曾出現過的、薩波當初潛入德雷斯羅薩的故事。