Ep. 12: Slaine surrenders after Harklight's destruction and Inaho saves him, leading to a peace treaty.

Following Asseylum’s speech, the Orbital Knights halt their assault due to confusion. Slaine orders the Moon Base evacuation and surrender to the UFE, but Harklight disobeys, leading to the destruction of his forces during a charge against the Deucalion. With nothing left to lose, Slaine pilots the Tharsis to fight Inaho in single combat. Both mechs sustain heavy damage, but Inaho wins narrowly. As the Tharsis falls toward Earth, Inaho grabs it to stabilize the descent and save Slaine. Later, Earth and Vers sign a peace and trade agreement involving Aldnoah technology. Slaine is publicly blamed for the assassination attempt and reported dead, but he is secretly imprisoned. He asks Inaho why he was spared, learning that Inaho acted on Asseylum’s wish to save him. Realizing Asseylum still cares for him, the series concludes with Asseylum, Inaho, and Slaine smiling toward the future.

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