Gargantia on the Verdurous Planet

Kugel's fleet prepares itself to attack the Gargantia. Ledo tries to dissuade Kugel with no success while Pinion is approached by Lukkage who plans a rebellion at the fleet. Confused about what he should do, Ledo witness the people of the fleet throwing their sick and weak on the water and fearing that the same will be done to Bebel, he decides to confront Kugel by himself. Agreeing with Ledo's decision, Pinion equips Chamber with some extra weapons, while Lukkage and Flange make preparations for the impending uprising. Melty is instructed by Ledo to deliver a message to the Gargantia, but she almost faints by traveling so far by herself and is rescued in the nick of time by Amy. Informed about Kugel's attack, the crew of the Gargantia consider to abandon the fleet as Ledo suggested, but Amy insists that they should do something to help Ledo as well, and Oldham instructs Ridget to make use of the special key Fairlock entrusted her.

With all the Hideauze in the area killed, Pinion and his crew manage to salvage ancient technology not seen anywhere, but instead of sharing it with the rest of mankind as originally planned, Pinion claims that they have the right to keep it to themselves, and sends a message to the other fleets warning them to keep out of their territory. As the message reaches the Gargantia, the fleet had just reorganized itself and there is the concern that other ships may leave to join Pinion's side as well. With the technology salvaged by them, Pinion's fleet defeats a hostile pirate crew who in return asks for a place among them, and he agrees. Ledo, still in shock upon learning the truth about the Hideauze hears from Chamber that the lightbugs that mankind use as power source were also created by the Hideauze as well which further proves their discovery.

On his deathbed, Fleet Commander Fairlock entrusts Ridget with Gargantia. Meanwhile, Chamber finally gets a fix on the location of the Galactic Alliance, but they're so far away that Ledo will never be able to get home. As preparations are underway for Fairlock's funeral, Shipmaster Flange announces that he's leaving Gargantia. Ridget struggles to keep other Shipmasters from following suit. Pinion has plans of pillaging the ocean floor, so he joins the like-minded Flange. Amy is sad when two people she cares about are leaving as well, Melty and Ledo...

Ledo decides to work as a fisherman, but he finds himself unable to pilot a regular Yunboro and sends Chamber to assist the other fishermen instead. Pinion then invites Ledo for lunch and offers him a position at his crew, but Bellows appears and also offers him a job at her salvage team. In the occasion, Amy and her friends dance to the crowd and Ledo mistakes a cooked octopus for a Hideauze and is about to shoot it until the others assure him that it is not an enemy, but food instead. Chamber, who finds himself causing a mess among the fishermen asks for Ledo's help and he uses his mecha to properly help the workers have a nice catch. Later in the night, Amy spends some time alone with Ledo, and a lighting puts him in state of alert and he arms himself to defend her, until she calms him down and dances to him upon his request.

In order to compensate for the damage to the hangar they caused, Chamber is put to work hauling around heavy cargo, but that leaves Ledo on the sidelines with nothing to do. Amy takes him around the fleet and introduces Ledo to the knowledgeable Dr. Oldham as well as her sickly but wise younger brother, Bebel.

Deciding to try and open a dialogue with these people, Ledo stays pinned to the pylon. They ask to talk to the Alliance in charge, but the crew have no idea what he is talking about and they believe that Chamber, who is translating, has another person inside. As Ridget, the commander, and the crew try to decide what to do, Amy gives Red food and begins talking. She explains that this is Earth, and when it was frozen over, some humans escaped to the stars while others stayed. Eventually, the ice melted and became a vast ocean, in which many people form fleets to salvage old technology from below. Looking for other items advanced technology, Ridget sends Bellows to the point where Chamber and Ledo Were found, and her ship is attacked by pirates. Amy asks Ledo to help them, and he agrees with the intention of earning their trust. Ledo boards Chamber and efficiently eliminate all enemies with no harm to Bellows' ship and crew, as Amy and the others watch in awe at its destructive power.