About the Fish-Man Island Arc
The Fish-Man Island Arc is the 25th story arc of the manga and anime One Piece, both the second and last story arc of the Fish-Man Island Saga, and the second story arc of the second half of the series.
The Straw Hat Pirates finally arrive at Fish-Man Island, where they learn the history of Fisher Tiger and the ongoing discrimination between humans and Fish-Men. Meanwhile, the New Fish-Man Pirates plot to overtake Ryugu Kingdom and establish Fish-Men as the supreme race.
After the Straw Hats escape, in a place in the Sabaody Archipelago known as "No Man's Land," Coribou and Caribou, along with their crew, have captured the remaining Fake Straw Hat Crew and are digging their graves. The fakes beg the brothers to let them go, but they refuse, revealing that they had planned to kill the real Straw Hats from the inside after joining them and were not amused when they found out they had been lied to. When Drip, the fake Sanji, continues to beg, Caribou reveals he has Devil Fruit powers, turning his arm into a gooey substance and smothering him. Fake Sogeking tries to shoot him, but the cannonball ends up being absorbed into his body, revealing that he is a Logia user. Caribou orders his men to bury the imposters alive. He then excitedly announces that he managed to confirm the real Straw Hats' location.
Back in Grove 46, Sentomaru reports back to his base, mentioning he managed to capture Demaro Black and most of Demaro's recruited pirates except for the Caribou Pirates and the other Straw Hat Imposters (sans Cocoa and Fake Chopper), who somehow disappeared from the plaza. He also comments on the Straw Hats' newfound strength after easily destroying the two Pacifistas he brought along with him and tells his base to call Marine Headquarters in the New World and warn them that the Straw Hats have finally returned.