One Piece Omnibus Edition volume 22 contains volumes 64-66 and features story and art by Eiichiro Oda.

Luffy and his crew befriend some of the exotic mer-people on Fish-Man Island, a beautiful and dangerous underwater civilization. They learn that while some on the island are working toward a better relationship with humans, the Fish-Man Pirates are attempting to grasp ultimate power. Luffy and the Straw Hat Crew step into battle once again!