Chakuro's peaceful life on the Mud Whale is interrupted by the appearance of another island. When they investigate, he finds a girl living there.
The rebellious Ouni takes Chakuro and Lykos back to her island. She explains that she's an Apátheia, a soldier who's lost her emotions.
The Mud Whale is invaded by the ruthless and mysterious troops of the "Empire." Using magic, Ouni and some of the others begin fighting back.
After naming Suou the new mayor of the Mud Whale, the elders tells him some secrets. Chakuro has a disturbing vision when he meets Neri.
The committee orders the vigilantes to attack the Nous, which Lykos says is the Mud Whale's heart. The island shakes while Ouni fights Shuan.
The Mud Whale's magic users begin training to use their skills in combat as part of Suou's defense plan, but not everyone is happy with his decision.
Imperial forces attack the Mud Whale during a sandstorm. Now Ouni and Lykos must lead the defense squad to fight for the island.
Lykos confronts the Imperial forces and Ouni attempts to help her and Chakuro reach the Nous. Shuan and Liontari continue their duel.
Though badly outnumbered, the Mud Whale's defenders continue to fight valiantly. Ouni and Nibi make a last stand against the Imperial forces.
The Mud Whale survivors hold funeral rites for friend and foe alike. Though peace seems to have returned, Lykos warns that her brother won't give up.
Orca is brought before the military high command for judgment, but he's in no mood to accept their decision. Lykos confronts Rochalízo.
Now that they know the truth, the Mud Whale's residents face a decision. Meanwhile, Orca carries out his own plans in the empire.