Japan / SEASON

Astral Ocean

24 listed episodes · First aired April 11, 2012

Season overview

On the island of Iwado, 13 year-old Ao Fukai lives with an aging doctor after the disappearance of his parents. When Iwado is attacked by an organization known as Secret, Ao unexpectedly finds himself at the controls of the Nirvash, a robotic fighting machine. Alongside his childhood friend Naru Arata, a teen girl with psychic powers, Ao heads into battle, determined to protect his island home.

EPISODE GUIDE

Episodes

Full guide ↗
E1Born Slippy (Deep Blue)

April 2025. While helping his childhood friend Naru Arata, Ao Fukai accidentally takes a bracelet being smuggled by Gazelle, Pippo, and Han Juno, and a Scub Coral suddenly appears, along with a G-Monster. Gazelle and hi…

E2Call It What You Want (AO's Cavern)

The G-Monster continues its attack on Iwato Jima, and with Gazelle's help Ao pilots an IFO being transported by the Japanese Navy and uses it to defeat the G-Monster, his hair changing color to turquise in the battle, a…

E3Still Fighting (Secret Operation)

Ao is hunted down by the people of Iwato Jima because they still believe that he and his mother are to blame for the terrible accidents that befell the island when she appeared out of nowhere. While in the custody of lo…

E4Walk This Way (Plant Coral)

With renewed resolve to protect Iwato Jima, Ao takes on the G-Monster with some help. And in the aftermath, Ao begins to learn that the world is more complex than he realized. In hopes of finding his mother and learn mo…

E5Tighten Up (Generation Bleu)

While adjusting to life on Generation Bleu, Ao begins to feel uncertain about why he joined them in the first place. Meanwhile, Team Goldilocks is under attack during an operation.

E6Light My Fire (Noblesse Oblige)

Team Pied Piper is dispatched to aid Team Goldilocks, but upon their arrival, they find that their leader sacrificed himself to save his companions. After retrieving the pilots and their IFO, they return to confront the…

E7No One Is Innocent (Bye Bye Angel)

The stranger, who names himself "Truth" invades Generation Bleu's headquarters in search for the Nirvash. After having a confrontation with him, Ao is knocked unconscious and dreams about Truth approaching Naru and disa…

E8One Nation Under a Groove (Blue Thunder)

A Secret appears in the Republic of Faisal Arabia, but on behalf of its interests, the United States government exerts its pressure on Generation Bleu to not engage it. Ao's comrade Fleur Blanc reveals to him the reason…

E9In The Dark We Live (Enemy Below)

The Japanese government runs an experiment on Tokyo Bay trying to create its own Plant Coral. However, a Secret appears and starts wreaking havoc. Team Pied Piper is dispatched to the area, but when Ao is informed that …

E10Release Yourself (The Pied Piper of Hamelin)

A Scub Burst appears in Phoenix, Arizona and while Team Pied Piper is on standby waiting for an official authorization to intervene, Ao and Ivica get ahead to evaluate the situation. As they arrive there, Ao meets Truth…

E11Plateau of Mirrors (Mirror of the World)

Team Pied Piper returns from a mission in Australia, unaware that they had brought with them a sand-like substance that makes the child pilots have strong hallucinations. Meanwhile Gazelle and his friends investigate th…

E12Step Into a World (Heaven and Earth)

Team Pied Piper goes to a Generation Blue Space Station to deposit the collected Quartz. While there a Secret attacks a Scub Coral that materialized in low orbit, and Pied Piper is sent out to intervene. Meanwhile, Trut…

E13She's a Rainbow (Moonlight Ship)

On board the Gekko, Ao discovers that the Eureka before him is a past incarnation of her, from the time she was still pregnant. Soon the ship is surrounded by the Japanese and Okinawan armed forces, all desperate to tak…

E14Starfire (Another Truth)

Despite Truth's intervention, Ao manages to return Eureka to her proper time, but hears from her that the baby she is carrying is not a boy, but a girl. After returning home to find more about it, he learns from his gra…

E15War Head (Humanoid Secret)

Wondering about Eureka's claim that the Secrets are not enemies, a sleep-deprived Ao is sortied along his team to confront a Secret which has appeared beside a Scub Coral that was mysteriously reactivated. Ao is shot do…

E16Guardian's Hammer (Next Phase)

Several countries join Generation Bleu's special operation to lure all Secrets that have appeared arround the world to a deserted area in the Arctic and destroy them. The plan goes well until Truth interferes and Ao tak…

E17La Vie en Rose (Johansson's Book)

Ao confirms that the members of Team Goldilocks are leaving ordinary lives as if they were never assembled at all. However, the public opinion starts turning against Generation Bleu and during an operation in the middle…

E18Don't Look Down (Third Engine)

To protect his comrades, Ao surrenders himself, the Nirvash, and the Quartz Gun to the U.S. army. As the whole world questions about Generation Bleu's actions, Fleur and Elena decide to launch an attack on the carrier w…

E19Maybe Tomorrow (The Day)

Furious upon hearing that he is actually a Secret who lost his memory, Truth destroys Generation Bleu's space station among thousands of satellites around the globe. The Allied Forces blame Generation Bleu for the incid…

E20Better Days Ahead (Last Message)

After learning that both Elena and the members of Team Harlequin switched sides to join the Allied Forces, Ao and his friends manage to escape taking the Quartz Gun with them. With nowhere to run, the remaining members …

E21World to World (Rising Sun)

Team Pied Piper, the Japanese Government and the Secrets join forces to prevent the Allied Forces from claiming the Scub Corals' Quartz. While Naru rallies supporters for her cause of having the Plant Corals shut down. …

E22Galaxy to Galaxy (Coral Carriers)

Truth attacks Ao who is rescued by Naru when he teleports him and the Nirvash to her side at Okinawa. Reunited once more, Ao and Naru discuss the situation when Team Harlequin appears and reveals that Truth's current fo…

E23The Final Frontier

Truth and Ao fight for the Quartz Gun until it fires once more, erasing Truth and converting Ao's Nirvash into the "Nirvash Neo". It also rewrites history once more to render it like Generation Bleu defeated the Allied …

E24Gates of Summer

After having a brief encounter with the phased-out Eureka, Renton sets with Ao to Iwato-Jima where he thanks Toshio for taking care of his family and then decides to make use of the Quartz Gun to destroy the original Sc…