第 12 集: Nagate與Benisuzume正面對決，Samari的小隊則潛入Gauna的胞衣內部，企圖摧毀Master Gauna。

Following the impact of the Heigus beam, the remaining pilots regroup and attempt to break into the enemy placenta. With her Guardian damaged, Ren Honoka entrusts Nagate with her last core-piercing projectile, asking him to defeat Benisuzume (Crimson Hawk Moth) and avenge Hou's death in her place. Ren then withdraws from the battle, along with damaged unit 314. Nagate then stays behind to confront Benisuzume, while Samari and the seven remaining pilots fly inside the Gauna pod to destroy the 'Master Gauna'. Nagate engages Benisuzume in a vicious duel, and is knocked unconscious when his frame is hit, but he is just barely saved by Izana, who is subsequently injured when her frame is damaged by the pursuing Benisuzume. After regaining consciousness, Nagate exhausts his ammunition fighting Benisuzume, and in a last ditch effort, fires Tsugumori's entire left hand, holding the projectile given by Ren, into the Gauna, finally destroying it. Meanwhile, after pilot Kōichi Tsuruuchi exhausts the last of his Heigus supply breaking through the last barrier protecting the 'Master Gauna', the remaining members of Samari's platoon destroy the Gauna's main core. Carrying Tsuruuchi with them, Samari and Seii escape to safety with the others as the anti-planetary missile obliterates its target. Back on the Sidonia, Ren thanks Nagate for fulfilling his promise to avenge Hou, and explains that she and her sisters are only five years old, having undergone accelerated growth and compressed mental training. Nagate pays a visit to Kunato upon learning that the latter intends to quit being a pilot, and despite being unable to forgive him, expresses his desire to fight alongside him in Sidonia's defense, but Kunato leaves without answering. Afterwards, Nagate leaves to visit Placenta Shizuka again, unaware that she is not in the lab anymore. (Source: Wiki)

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