The land has fallen into ruin, and children represent the last hope for humanity. One of them, Hiro, fails to live up to that purpose and decides to walk away from it all.... until he meets a girl with horns.

The parasites struggle to come to terms with Hiro being the one who piloted Strelizia. Even Hiro can't really believe it himself. Things come to a head when he's ordered to participate in a mock battle.

With the squad still feeling the aftershocks of the previous mission, things come to a head as the leaders run out of patience and decide to summon Strelizia back to the front lines.

Squad 13 is given a much-needed break after defending the kissing plantations in a fierce battle. They head to an unexpected location and find something even more unexpected

APE decide to give Squad 13 a reward in order to accelerate their development. The ceremony is held in a place Zorome has always dreamed of living in, and there he meets someone he has always wanted to meet.

The fierce battle to take the Grand Crevasse begins, and Hiro is forced to watch from the sidelines. Zero Two may have left, but Squad 13 is still concerned about the way she fights.

The parasites' living situation has changed drastically after the battle for Gran Crevasse. Zero Two's attitude toward them seems to have changed drastically, too.

Having seized Gran Crevasse, emissaries are sent out to demand the surrender of the klaxosaurs' leader. Meanwhile, the Nines visit Squad 13, and there a shocking discovery is made.

Squad 13 is told they will be abandoning Mistilteinn soon, and they decide to go out with a bang by making one last memory of their lives there.

Dr. Franxx confronts the APE brass about what they did to Kokoro and Mitsuru, and their attitude makes him reflect on his past, the choices he and humanity made, and the path they took.

Humanity's operation to wipe out the klaxosaurs once and for all begins, and APE sends Strelizia to take control of Star Entity, the enemy's biggest weapon. However, the klaxosaur princess has other ideas.