第 3 集: Nagate 參加重力節慶，Akai 小隊則面臨 Gauna 的致命威脅。

The veteran pilots and Yuhata Midorikawa, another cadet, inquire with Nagate about his fight with the Gauna but decide to let it for another day after realizing that he is still in recuperation. Later at night, Nagate learns that a festival known as the Gravity Festival is being held and leaves to check it out. There is also fighting competition between guardian pilots being held and despite Kunato's best efforts, he is defeated by Akai, who remains the reigning champion. Yuhata meanwhile hacks into the records of Nagate's battle against the Gauna and concludes that Akai made use of that information to improve his skills. Back at the festival, Nagate meets Shizuka and they hang out together and Izana, who was looking for him, gets flustered upon seeing them together, injuring herself when an angered Kunato bumps into her. Nagate confronts Kunato for not helping Izana and he is injured once more while fighting him. Meanwhile, Captain Kobayashi learns that the Gauna 487 had reappeared and is approaching Sidonia. Kobayashi assigns Akai's squad to deal with it. While recovering, Nagate and Izana are invited by Akai and his friends for a ride inside Sidonia's sea area before they sortie to fight the Gauna. The next day, the cadets watch Akai and his fellow squad members Momose Hinata, Aoki Kashiwade, and Izumo Midorikawa depart to confront the enemy, but the operation ends in failure as all pilots are killed by it. (Source: Wikipedia)

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