第 8 集: 仲園、佐瑪莉與久多羅小隊與Gauna交戰，同時Nagate取回形似Shizuka的樣本

Nakazono squad, Samari squad(units 005, 007, 026, & 174), and Kunato squad (units 701, 704, 705, & 706) confront the three Guardian-like Gauna. The Kunato squad upon after firing their Heigus particle cannon exposes a human-like ena from the Gauna. After destroying Gauna 491, Nagate retrieves a human-like Gauna sample. Samari squad engages and destroys Gauna 489. Nakazono squad engaged Gauna 490, which communicates with them through radio with Shizuka's voice after killing each squad member of the Nakazono squad. Gauna 490 continues to communicate over the radio leading Kunato to panic. The remaining Kunato squad members engages Gauna 490 resulting in the death of Ho Honoka. Upon Nagate appears the remaining Gaunua 490, later nicknamed "Benisuzume" or "Crimson Hawk Moth", retreats. After the battle, the pilots mourn five of their companions who were KIA, while Captain Kobayashi is confronted by Lala over her orders to have Nagate sortie on every mission, knowing that it may eventually lead to his death. Kobayashi then reveals that Nagate is immortal, and by not being a member of the Immortal Ship Crew that rules over Sidonia, he was seen by the other Immortals as a liability, but she claims that by having the skills of their late friend Saito, he will not die so easily. As Lala returns to the dorms, she reminisces about the events of the "Fourth Defensive War" 100 years ago when almost all citizens of Sidonia perished during a Gauna invasion. Only 392 citizens and 25 council members survived including herself, Kobayashi, Saito and Ochiai, who was held responsible for the tragedy, but was spared from execution because several important files from Sidonia's archives were copied by Ochiai to his brain while deleting the original files. The files were then relocated to an auxiliary database only accessible through his brain which was transferred to a clone of Ochiai. After the incident, Saito disappeared without a trace, only reappearing 80 years later as an old and aged man because he had renounced his immortality and refused to take life-prolonging medication. To preserve Saito's memory, Kobayashi ordered the creation of a clone of his, which was in fact Nagate, but Saito refused to have his mind transferred to the child, and kidnaps the infant Nagate with Lala's help, claiming that he will teach him his pilot skills nonetheless. Back to the present, the Gauna's placenta sample retrieved by Nagate is revealed to have the same appearance as Shizuka, and while in containment, it utters some words including Nagate's name. (Source: Wiki)

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