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.
Ichigo, Goro, and the rest of Squad 13 engage in a battle far more dangerous than any they've fought before, all while having their mind preyed on by the fact that this will be Hiro's third ride with Zero Two.
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.
Squad 13 heads back to the Garden for testing, with Zero Two's emotional state worsening by the day. They run into Nine Alpha, who offers some insight about her, but the most revealing words come straight from the horse's mouth...
In the deepest, darkest parts of a forest lived a strong and beautiful beast princess. Beckoned by the moonlight, she wandered into a land of humans, and in the moonlit garden of a small castle, she fell in love with a prince.
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.