Nagate achieves brilliant military results, and he is the admiration of pilot trainees. Meanwhile, Kunato sneaks into Ochiai's secret laboratory where was sealed off.

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When Sidonia has a hard fight against Gauna, a Human-type Gauna appears and gives protective covering fire for Sidonia. The Human-type Gauna has familiar voice, and introduces itself to all as Tsumugi Shiraui.

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Cap. Kobayashi decides a new course toward Ninth of Lem Star System.

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Although Gauna-550 captured Tsumugi, Kunato thinks that it's an opportunity to try out the new weapon which she has.

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Nagate and Yuhata visits Izana and Tsumugi in the hospital and laboratory.

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Nagate had to leave the dormitory. He didn't know where he should go, and wants Izana to help.

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It seemed that testing of a new weapon succeeded, but the weapon gets out of control.

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Yuhata begins to live with Nagate, Izana and Tsumugi, under the pretext of the supply-restriction started.

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Nagate and Izana go to Sensyukyo where there is some of the greatest scenic beauty in Sidonia.

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The reconnoitering party which included Izana leaves for the Ninth of Lem star system.

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Nagate and Tsumugi go to the Ninth to rescue the reconnoitering party. They encounter an unexpected enemy there.

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Beni-Suzume lets its own Ena invade the Tugumori Custom-2 inside, and reproduces Hoshiziro in the cockpit where Nagate is.

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