The special takes place during the two year before the Straw Hats reunite on Sabody. Luffy is currently in Rusukaina training to get stronger to take on the New World. However the training is interrupted when Hancock's sisters, Marigold and Sandersonia, are kidnapped by the Byrnndi World, a pirate who was locked away on Level 6 of Impel Down but escaped during Luffy's invasion to save Ace, in order to lure Hancock to him and use her as a hostage against the World Government due to her Shichibukai status. Thus Luffy and Hancock head off to confront him and save Hancock's sisters.
| Crew | Eiichiro Oda | Creator |
| Writing | Hirohiko Uesaka | Writer |
| Art | Osamu Honda | Art Direction |
| Sound | Kouhei Tanaka | Original Music Composer |
| Directing | Naoyuki Ito | Director |
| Sound | Shiro Hamaguchi | Original Music Composer |
| Writing | Jin Tanaka | Writer |
| Writing | Tomohiro Nakayama | Writer |
| Directing | Yukihiko Nakao | Assistant Director |
| Visual Effects | Koudai Watanabe | Animation Director |
| Visual Effects | Koudai Watanabe | Character Designer |
| Directing | Aya Komaki | Assistant Director |
