Fish-Man Island was saved by the timely arrival of the Sea Kings, but all is not well. Luffy lost a lot of blood in his battle with Hordy, and fish-to-human transfusions are strictly forbidden!

As word of the Straw Hat resurrection spreads through the Navy, Luffy and his crew get acclimated to their underwater environment, and Franky reveals the startling identity of the man who protected their ship!

The Caribou Pirates attack the Straw Hats. While Caribou manages to get on the Thousand Sunny, the rest of his crew gets pulled away by Mohmoo, who gets frightened when he recognizes the Straw Hats from his time in Arlong Park. Caribou is left alone and, as a result, is captured by the Straw Hats. The Straw Hats come across the Kraken, which destroys the ship of the Caribou Pirates, who returned to save their captain, and then attacks Thousand Sunny. The Straw Hats manage to avoid its attacks and Luffy, along with Zoro and Sanji, are getting ready to fight it.

After their quarrel with the Kraken, the Straw Hats find themselves in hot water as Luffy, Zoro, and Sanji turn up missing, and the rest of the crew runs short on air!

The Flying Dutchman shows up and Vander Decken tells Wadatsumi to crush the Thousand Sunny, but then the Kraken beats Wadatsumi. The volcano erupts, and the pirates run from it. Surume jumps off a cliff and some big stones are about to crush them but Usopp stops them for a while with his new move, called Sargasso. But, when they are celebrating their survival, a rock hit Surume's head, made it faints as they are descending to the depth of the cliff. At the bottom of the cliff, they find Fishman Island but when they are about to enter, they are stopped by a group of sea monsters and someone riding it.

The Straw Hat Pirates encounter Hammond, some sea-beasts and other fishmen from the New Fishman Pirates. Franky launches the Coup de Burst towards Fishman Island to escape the pirates. Unfortunately the Straw Hats get separated from the Sunny and from each other. Luffy wakes up after a while only to reunite with Keimi, Usopp, Sanji and Chopper. They leave Keimi's house and go to a higher level of the island where they meet other mermaids. Meanwhile, Hammond informs their leader about the Straw Hats entering Fishman Island.

When Sanji gets up close and personal with a mesmerizing mermaid, his extreme fondness for the female form lands him in a life and death situation. Could the Straw Hat chef die from a nosebleed?!

As blood donors are finally found, the recovering Sanji stays at the Mermaid Cafe while Luffy, Usopp and Keimi meet Pappug and Brook. The five of them head for Pappug's home. In the meantime, Ishilly and her friends vanish after opening the barrel that was washed up together with the Straw Hats and the episode ends with Madam Sharley predicting that Luffy would destroy Fishman Island.

The episode starts with Gyro escaping from Hody Jones who in turn goes after him. The Straw Hat Pirates are in a town on Fishman Island and King Neptune and Megalo appear to invite the Straw Hats to Ryugu Palace. Hody destroys Gyro's ship with handcuffs on to show how powerful he is. He defeated them all but left them still conscious so that they can tell about what is happening under sea to the people on earth.

A trio of unsuspecting mermaids find themselves in hot water after releasing a bad guy from his barrel of a prison. Over at the royal palace, Luffy gets up close and personal with the Mermaid Princess!

Luffy’s lightning reflexes spare the Mermaid Princess from a grisly death, Neptune’s army attempts to apprehend the Straw Hats, and Captain Vander Decken forges a sinister undersea alliance!

With their backs against the wall, the Straw Hats are forced to take King Neptune and his men hostage. On the other side of the palace, Luffy and the Mermaid Princess make plans to visit the Sea Forrest!

Luffy accidentally “kidnaps” the Mermaid Princess, an old friend issues a grave warning to Chopper and Sanji, and the New Fish-Man Pirates prepare for a raid on Ryugu Palace!

Captain Vander Decken and Hordy Jones manage to successfully breach the defenses of Ryugu Palace. Meanwhile, Jimbei waits patiently for Luffy to arrive at the Sea Forest.

Robin ventures into the forest in search of ancient secrets, Zoro takes to the water for a slicing, dicing showdown with Hordy Jones, and Luffy is branded a royal kidnapper by an angry mob of fish folk!

Luffy, Chopper, and Sanji are taken prisoner by a fish mob just as Vander Decken launches an attack the princess! Elsewhere, Zoro continues his battle with Hordy, and Nami hitches a ride on a mermaid to escape the crumbling palace!

Zoro and Neptune fight bravely, but they’re no match for Hordy and his pill-popping minions. Back at the ship, Luffy reunites with Jimbei, who reveals something sinister about his past.

The New Fish-Man Pirates continue their bloody and violent uprising, and Jimbei begins the story of how he unleashed the monster known as Arlong on the unsuspecting citizens of the East Blue.

Jimbei continues his story with tales of fish-men taken as slaves, Queen Otohime’s fierce devotion to her people, the legend of Fisher Tiger, and the sinister rise of Arlong.

Arlong’s violent tendencies are condemned by Fisher Tiger, and the arrival of a young human girl teaches the Fish-Man Pirates a lesson in compassion.

The great pirate Fisher Tiger keeps his promise to a young slave girl, but the adults in her village are determined to make him pay for his act of honor.

After the death of Fisher Tiger, Arlong's abuse of humans lands him in jail, Jimbei becomes the captain of the Sun Pirates, and Queen Otohime's passion to see her vision come true is renewed!

Tensions run high when a slave-owning Celestial Dragon washes up on Fish-Man Island. His former captives cry for out for blood, but Queen Otohime sees it as a chance to mend fences between the gilled and non-gilled!

After an agonizing absence, Queen Otohime returns to her people with exciting news. Unfortunately, a horrific act of violence derails the queen’s mission and changes life on Fish-Man Island forever.

Jimbei reaches the heartbreaking conclusion in the story of Queen Otohime, Nami does something completely unexpected, and Hordy Jones makes a foreboding appearance!