Fushigi no Umi no Nadia

Jean travels to Paris for an inventor contest while protecting Nadia and her mysterious necklace.

Jean, a young inventor, travels to Paris to participate in an inventor contest held at the Universal Expo of Paris. During his stay, he encounters a young girl named Nadia. She is being pursued by henchmen who are seeking her Blue Water, a mysterious necklace. This artifact serves as the crucial link to Nadia's past. Jean becomes involved in her situation as the antagonists attempt to retrieve the item. The narrative focuses on Jean's journey to the competition and his subsequent interaction with Nadia amidst the pursuit by those interested in the secrets held by the necklace.

Jean and Nadia travel to Africa to uncover her origins after rejection in Le Havre

Jean escorts Nadia back to Le Havre, where her relatives refuse to accept her into their home. Determined to help her understand her background, Jean proposes a journey to Africa, the continent from which she originated. This decision marks the beginning of a new adventure aimed at discovering the truth about her past. The pair leaves their current situation behind to pursue answers in a new location, driven by Jean's commitment to supporting Nadia as they seek to resolve the uncertainty surrounding her identity and history.

The Abraham Battleship Encounters a Mysterious Sea Monster Threat

Jean, Nadia, and King are rescued from the sea by the American battleship Abraham. Captain Melville and First Mate Holland hunt a sea monster blamed for sinking ships in the Pacific. Jean finds the voyage interesting, but Nadia remains suspicious. They meet Ayerton Grenavan, a flamboyant scientist funding the mission. That night, the ship is attacked by a dangerous presence. A torpedo strikes the Abraham, throwing Jean, Nadia, King, and their aircraft back into the ocean.

Jean, Nadia, and King are rescued by Captain Nemo's mysterious submarine, the Nautilus.

Jean, Nadia, and King are rescued from the ocean by Captain Nemo and his first officer, Electra. They remain aboard the vessel for three days while Nemo pursues an enemy submarine responsible for wrecking the Abraham. After this period, the children are released and depart in Jean's newly revamped aircraft. Prior to their departure, they discover that the submarine is named the Nautilus.

Jean, Nadia, and King crash on an island and meet a young girl named Marie.

Jean, Nadia, and King are shot down and crash-land on an unknown island. They rescue a 4-year-old girl named Marie, whose parents were killed by masked soldiers. The group flees from these soldiers and finds refuge in a secluded cave stocked with supplies. Jean and Nadia bury Marie's parents, with Nadia tearfully informing the child of their deaths. Meanwhile, the Grandis gang washes ashore and is captured by the same soldiers. They are taken to a hidden base where the commander interrogates them regarding the Blue Water and Nadia's pendant.

Jean and Nadia infiltrate the island's secret factory complex to rescue Marie and King.

Jean investigates the island and finds a power plant in a central crater, witnessing a villager killed by soldiers. Meanwhile, Marie and King wander outside their cave to gather flowers while Jean and Nadia debate whether to rescue the islanders. The children are captured by soldiers, prompting Jean and Nadia to follow them to a factory complex where villagers are enslaved. They identify a submarine called the Garfish, commanded by the ruthless Gargoyle. When Nadia’s Blue Water artifact activates near Gargoyle’s secret weapon, the group attempts to escape. To save Jean from execution, Nadia surrenders herself, and Jean vows to rescue her.

Gargoyle forces Nadia to reveal the Blue Water's location while showcasing the destructive Babel tower.

Soldiers known as Neo Atlanteans capture Nadia and bring her before Gargoyle, who claims to have known her since infancy. He demands the location of the Blue Water, threatening to kill Marie and King when she refuses. Nadia reveals Jean possesses it, prompting soldiers to search the complex. Meanwhile, the Grandis gang attempts to escape, leading both groups to cross paths on a freight train heading to Gargoyle's castle. Gargoyle gives Nadia a tour of the facility, highlighting the central spiral tower called Babel, capable of destroying everything in its path. That evening, he forces her to watch the tower demolish a distant island. At sea, Captain Nemo witnesses the explosion and identifies the event as the release of a great abomination.

Jean allies with Grandis gang to infiltrate compound and rescue Nadia from Gargoyle's submarine.

Jean teams up with the Grandis gang to infiltrate a compound and rescue Nadia. Their mission nearly succeeds until Gargoyle's submarine, the Garfish, corners them at the intake point. Just as hope fades, the Nautilus emerges from the ocean and attacks the Garfish, enabling the group to escape. Gargoyle then attempts to counterattack using the Tower of Babel, but the structure collapses and destroys his compound instead. The islanders are freed from captivity, while Gargoyle manages to flee the scene aboard a dirigible.

Nemo's Secret: The Nautilus Visit and Blue Water Discovery

Captain Nemo invites the group aboard the Nautilus to thank them for fighting Gargoyle and to repair the Gratan. Jean and Hanson admire the ship's technology, while Grandis catches a cold. The doctor treats her, and when Captain Nemo and Electra visit the medical bay, Grandis falls in love with him, upsetting Sanson and Hanson. Later, Nemo meets Nadia for the first time and is surprised by her Blue Water. It is revealed that Nemo possesses his own Blue Water, which is larger and has a missing indent. This encounter marks a significant moment between the characters as they navigate their new surroundings on the submarine.

Grandis, Sanson, and Hanson attempt to clear mines for the Nautilus escape.

The Nautilus is trapped in a minefield within the LeMar Straits while fleeing Gargoyle. Grandis, Sanson, and Hanson volunteer to use the Gratan to destroy three mines. Sanson knocks Grandis unconscious to protect her, leaving him and Hanson to pilot the tank. Jean secretly boards the vehicle to assist them, but the Gratan suffers malfunctions and loses its camera, rendering it blind. Guided by Grandis’s voice from the Nautilus bridge, the trio works together to navigate the hazardous environment. They successfully detonate the remaining mines, allowing the submarine to escape the deadly trap set by their pursuers.

New recruits join the Nautilus submarine crew

The Nautilus visits an island where Jean meets Nadia and Grandis competes for Nemo's attention.

The Nautilus docks at an island for supplies, leading to awkward moments when Jean interrupts Nadia changing. Grandis and Electra vie for Captain Nemo's affection, though he remains unaware. Jean joins Sanson on a hunt while Nadia connects with Grandis, who reveals her tragic past. Grandis grew up wealthy and was deceived by a swindler, sparking an obsession with jewels like the Blue Water. However, meeting Nemo has diminished her desire for Nadia's treasure. The group returns at night with a killed baby deer, upsetting Nadia, who departs the camp in distress.

Marie is urged to flee in this episode title.

The crew ventures into Reef 64 to find a cure for Marie and Nadia's fatal tropical fever.

Marie and Nadia contract a tropical fever that will kill them in two days without treatment. Nemo alters the Nautilus's course to reach Reef 64, despite Electra's anger. He, Jean, Sanson, Hanson, and King travel through the underwater region to locate the necessary herb. They discover the plant in a cave on a cliff face. During their return, a monstrous eel named Dinicthys attacks them. Jean and King distract the creature by throwing their diving lights into a void. Nemo assists them in driving the beast away, allowing the group to retrieve the cure and save the girls from death.

The Nautilus Endures Mine Attacks and Fleet Ambush While Jean Mourns Fait

Days later, the Nautilus encounters deadly mines clogging its intakes and near-miss torpedoes. A Garfish ramming the hull is destroyed as the submarine drifts away. Surrounded by Captain Melville’s American fleet, which received an anonymous tip from Gargoyle blaming the sub for sinking ships, the Nautilus suffers critical damage and sinks to the ocean floor. Forced to remain submerged until the vengeful fleet departs, the crew faces dire conditions. Earlier, Ensign Fait offered Jean handmade flowers for Nadia, who rejected them due to memories of Gargoyle’s garden. Following the attack, Fait becomes trapped in a gas-leaking engine room. Nemo orders the area sealed to prevent further damage, leaving Jean to painfully listen to his friend die.

The Nautilus heads to Atlantis while Jean confronts his father's legacy and Nadia comforts him.

The Nautilus travels to the underwater graveyard of Atlantis to honor fallen comrades. Nadia questions why she was chosen to wield the Blue Water. Jean learns from Sonar Officer Eiko that her French ship was sunk by the Garfish, whose captain is his missing father. Traumatized, Jean discards his wrench and rejects invention due to technology's danger. Nadia feels sad and cheers him up by recalling their promise made in France. The episode concludes with Fait and his comrades being laid to rest in the soil, while Nadia cries on Jean's shoulder.

Jean Builds an Aircraft to Impress Nadia Despite Obstacles

Feeling infantilized by the Nautilus crew, Jean strives to mature but faces rejection from Nemo and discouragement from Electra and the Grandis gang. Nadia suggests Jean build a flying craft, inspiring him to construct an aircraft independently to prove his worth. He struggles with engine mechanics and initially refuses assistance from Hanson, which strains their friendship. Eventually, Jean changes his mind and accepts Hanson’s help to create the best possible plane. Upon completion, Jean takes Nadia on a flight above the clouds, successfully impressing her. This achievement reassures Nadia that Jean will eventually succeed in taking her to Africa, marking a significant step in his personal growth and relationship with his friend.

Captain Nemo sails the Nautilus to Antarctica to repair damage from Gargoyle while escaping a giant squid.

To repair damage from Gargoyle, Captain Nemo orders the Nautilus to sail to Antarctica. Passengers are horrified, with Sanson complaining about the unstable ice and Jean excited for the journey. Upon arrival, an ancient squid attacks the submarine. The crew tries ramming an iceberg to dislodge the creature, but this fails. They eventually succeed by steering toward an underwater volcano. The intense heat forces the squid to release its grip and drift away. The Nautilus then proceeds through a tunnel to reach its subterranean base. This sequence resolves the immediate threat while continuing the vessel's journey to the southern pole region.

Nemo shows Jean and Nadia his base, revealing an ancient whale friend and a future revelation.

During Nautilus repairs, Nemo guides Jean and Nadia through his facility, showcasing a world tree, frozen dinosaurs, and a penguin chamber. The highlight is Irion, an ancient whale close to Nemo, who tells Nadia she will soon find her father and brother. The group then observes an aurora over Antarctica. Finally, Jean demonstrates his latest invention to Nadia and Marie: a device that produces ice cream using Antarctic ice.

Jean's Glider Fails and Nadia Learns Electra's True Feelings

Jean tests a rocket-powered miniature glider on the Nautilus deck, but the engine backfires, causing the craft to spiral and explode. The crew fears Gargoyle will detect the noise, forcing Nemo to destroy additional Garfish submarines. Nemo reprimands Jean for his carelessness, prompting Nadia to defend him aggressively, which results in her being slapped by Nemo for insulting his crew. Meanwhile, Nadia’s jealousy regarding Jean’s friendship with Electra intensifies until Electra clarifies she views Jean merely as a lost younger brother. This revelation helps Nadia recognize Gargoyle as the murderer who killed Electra’s sibling years ago, leading her to realize her previous misjudgment of the situation was incorrect.

Nautilus trapped in trench faces magnetic weapon and battleship assault

The Nautilus survives a torpedo attack by six Garfish in the Kermodec Trench before Nemo destroys the fleet. Gargoyle then uses the SeaNet Beam Gun to lift the submarine toward his Neo-Atlantean battleship. Damage from an atomic vibrator weakens the Nautilus, prompting Electra to suggest self-destruction. Grandis opposes this, claiming she wants to die with Captain Nemo because he will never love her. The Grandis gang sabotages the battleship's missile tube using an annihilation bomb while Jean rescues Nadia from surrendering. The Nautilus engineers destroy Gargoyle's weapon with their final missile. The damaged submarine enters a whirlpool as Gargoyle orders another Garfish fleet to finish them off.

Electra confronts Nemo over Tartessos while the Nautilus sacrifices itself to destroy the Garfish fleet.

The Nautilus detaches its combat block to self-destruct with the Garfish fleet, saving the ship. Nemo moves the children to his cabin, warning they will be jettisoned. Electra shoots Nemo at gunpoint, revealing her tragic past. Thirteen years ago in Tartessos, Nemo stopped Gargoyle from using the Tower of Babel, destroying the kingdom and killing Electra’s family. Nemo rescued Electra two nights later, and she fell in love with him. She learned Nemo caused Tartessos’s fall but remained loyal to his goal against Neo-Atlantis. Jealous of Nadia, Electra tries to shoot Nemo again. Nadia realizes Nemo is her father and regrets her behavior. Nemo explains he fights to atone and spare Electra suffering. He stops Electra from suicide, releases the children, and urges Nadia to live.

Jean, Nadia, Marie, and King survive shipwreck on deserted island

Jean, Nadia, Marie, and King find themselves shipwrecked and washed ashore on a beach that is revealed to be a deserted island. Following extensive deliberation among the group, they collectively decide to remain on the island and establish it as their new home.

Nadia names their new home Lincoln Island after the president and struggles to survive in the forest.

Nadia rudely wakes Jean and Marie, claiming authority and naming their new home Lincoln Island after the president. She then abandons them to live in the forest, but survival without Jean’s technology proves difficult. Her only food source is stealing rations from Nemo's cabin. Nadia nearly drowns trying to retrieve a hologram from the cabin, requiring rescue by Jean and Marie. She becomes furious at them for catching fish, preferring they had not interfered. Marie confronts Nadia about her stubbornness, pointing out that the group would have starved without their efforts. The narrative highlights the contrast between Nadia’s idealistic nature worship and the harsh reality of their situation.