S1 E1 • It was the entirety of our precious world

Year 93 of the Sand Era. The people of the Mud Whale live peacefully in their island that drifts along the endless sandy sea. Chakuro, the archivist of the ship, discovers a mysterious girl, Lykos, during a scouting trip to an island in the sea of sand.

S1 E2 • Sinners of Falena

Chakuro, Ouni and Lykos arrive on the island Lykos. Lykos states that in the outside world that Ouni yearns for, soldiers without emotions, the apátheia, wage countless wars. After they return to the Mud Whale, Lykos and Chakuro view the flight of the Star Locusts. But afterwards, the peaceful days of the Mud Whale come to an end. Soldiers aboard a small boat appear and begin to indiscriminately attack the inhabitants of the Mud Whale.

S1 E3 • I've had enough of this world

S1 E4 • Drown in sand alongside the Mud Whale

After the death of Lady Taisha, Suou is appointed as the new chief as the Mud Whale. However, Suou learns that the Council of Elders is planning to sink the Mud Whale beneath the sea of sand - with everyone still on it! He is then imprisoned by the council beneath the ship. Neri attempts to warn Chakuro of what the council is planning, and a mysterious force appears to take over her body and show Chakuro visions of the dead and living. Chakuro, with the help of several of his friends, manages to get into the bowels of the ship, where they find Neri and a mysterious creature.

S1 E5 • I don't want to run

Deep in the bowels of the mud whale, Chakuro and friends discover the Nous that powers the ship. The elders attempt to kill it, but Lykos and Chakuro manage to stop them. Neri, who calls the Nous "Mother", disappears into it. Meanwhile, Ouni and Shuan's fight concludes, with Shuan's eye being revealed. Suou is then released from his prison and readies himself as the new chieftain of the ship. Lykos reveals to them more about the world. Suou then speaks to prepare the inhabitants of the Mud Whale for the attack in four days' time.

S1 E6 • Tomorrow, I Might end up having to Kill Someone

The inhabitants of the Mud Whale prepare for the attack in four days' time. Urumi and her friends talk to Lykos, offer her some new clothes, and ask her about the upcoming attack. At a meeting between Suou and his aides, the elder Lasha appears, and questions if what they are doing is really the right thing. Meanwhile, Nibi recalls his past with Ouni, whose origins seem to be a mystery. After getting thrown into the bowels together after a fight, Nibi promises to take Ouni to the outside world, and they become friends. Chakuro meets Aima, Neri's twin sister, who promises to tell him all of the secrets of the Mud Whale if he comes back alive from the attack on Skylos. Suou gives a final speech to the inhabitants of the Mud Whale, and they have a moment of brevity in the Sand Festival. On the day of the attack, a sandstorm occurs, reducing visibility. Chakuro, Lykos, Ouni, and Ginshu are all chosen to take part in the attack on Skylos. Nibi demands to be taken along as well. As the attack team prepares to leave, they see the first attackers from Skylos.

S1 E7 • I Want To See Your Future

As Chakuro, Ouni, Lykos, and the rest of the infiltration force prepare to take off, the Mud Whale is attacked by the soldiers of Skylos. The scene then cuts to the Skylos' commanders, and a strange device is seen that is used to control the Nous Skylos. The Skylos invaders reach the Mud Whale, and Nibi ends up tagging along with the infiltration force. Aima sings a song as the attack begins.The fighting on the Mud Whale begins, with causalities on both sides. Meanwhile, the infiltration force manages to fight off the soldiers of the Skylos, and proceed deeper into the ship. Arachni orders that Lykos be killed alongside the other intruders from the Mud Whale. Suou goes off on his own once he hears that the invaders have managed to infiltrate one of the towers. Elder Hakuji manages to protect some of the children from the invading soldiers, plunging off of a tower together with them. Suou runs over to him as he lays dying, as hears his last words before Liontari appears and finishes him off. Suou attempts to fight back using a sword taken from the invaders, but is brutally defeated. Right before Liontari kills Suou, Shuan stops him. The raiding party, meanwhile, has gotten closer to the Nous. They split into two parties: one to destroy the Nous, containing Tokusa, Urumi, and Lykos, and another to guard the entrance, containing Chakuro, Ouni, Ginshu, and Nibi. Lykos notices that there is a disturbing lack of guards in their way. Right as Lykos' party nears the Nous, the soldiers of the Skylos launch a surprise attack, and Chakuro rushes off to see what happened. It is then revealed that the attack killed everyone but Lykos and Urumi.

S1 E8 • Disappear From This World

With much sacrifice, Chakuro, Ouni, and the others arrive at the Nous Skylos. At that time, while the inhabitants of Mud Whale are defending themselves against the Empire, Liontari and Shuan confront each other.

S1 E9 • I Want to See Where Your Choice Leads

I Want to See Where Your Choice Leads is the ninth episode of the Children of the Whales anime. The remainder of Mud Whale's Skylos infiltration force confronts Commander Arachni near the Nous Skylos. Despite not being able to use Thymia, Ouni and Nibi show excellent cooperation and put up a good fight against the Imperial Soldiers. However...

S1 E10 • I'm Setting Off On A New Journey

I'm Setting Off On a New Journey is the tenth episode of the Children of the Whales anime. Due to the destruction of the Nous Skylos and its battleship, the fight between Mud Whale and the Imperial Soldiers ends. Later, a battleship different from the Skylos appears before Mud Whale.

S1 E11 • It's just a dream

In order to determine the responsibility of the destruction of Nous Skylos, Arachni and Orca are summoned by the top brass of the Imperial Army. Although the two were sentenced to death, Orca's rebuttal shifts the course of the scenario.

S1 E12 • Episode 12