A girl named Olga is pursued by both the World Government and a man named Mad Treasure, as she is the only one who knows the location of the Pure Gold, a substance that can buy the entire world. Olga ends up sailing with the Straw Hat Pirates, and they journey to find the Pure Gold on the lost island of Alchemi, which is located inside the stomach of a large angler fish named Bonbori.
| Actor | Role |
|---|---|
 Kazuki YaoFranky (voice) | Franky (voice) |
 Mayumi TanakaMonkey D. Luffy (voice) | Monkey D. Luffy (voice) |
 Kazuya NakaiZoro Roronoa (voice) | Zoro Roronoa (voice) |
 Akemi OkamuraNami (voice) | Nami (voice) |
 Yuriko YamaguchiNico Robin (voice) | Nico Robin (voice) |
 Hiroaki HirataSanji (voice) | Sanji (voice) |
 Ikue OtaniTony Tony Chopper (voice) | Tony Tony Chopper (voice) |
 Kappei YamaguchiUsopp (voice) | Usopp (voice) |
 Kiko MizuharaNaomi (voice) | Naomi (voice) |
 Minami HamabeOlga Myskina (voice) | Olga Myskina (voice) |
 Kiyohiko ShibukawaAshe Myskina (voice) | Ashe Myskina (voice) |
 Hiroyuki YoshinoPsycho (voice) | Psycho (voice) |
 Tomokazu SekiLucci Rob (voice) | Lucci Rob (voice) |
 Gaku HamadaTanaka-san (voice) | Tanaka-san (voice) |
 Kazuhiro YamajiGild Tesoro (voice) | Gild Tesoro (voice) |
 Shun OguriMad Treasure (voice) | Mad Treasure (voice) |
 ChoBrook (voice) | Brook (voice) |