One Piece: Defeat the Pirate Ganzack!

Synopsis

Luffy and his crew, consisting of Zoro and Nami, are adrift on a small boat, starving, when a massive creature attacks them. During the chaos, Nami is taken, leaving Luffy and Zoro to fend for themselves. They wash ashore on an island and meet a girl named Medaka, who tells them that the island's people, including her father, have been enslaved by the dreaded pirate Ganzack. Resolved to rescue the villagers and Nami, Luffy, Zoro, and Medaka plot an assault on Ganzack's fortress.

Background

One Piece: Taose! Kaizoku Ganzack was shown off at Jump Super Anime Tour in 1998 along side the Hunter x Hunter Pilot.