Six months after the battle between Chamber and Striker, the Cugel fleet has merged with Gargantia. Ledo is working as a member of Bellows' salvage team. On a salvage operation, Ledo discovers more records of the past civilization in a sunken ship with a salvageable hull. He reminisces about life on Gargantia with Chamber to Reema, whose ship had joined the Cugel fleet shortly before Cugel took it over. Later, he learns that the salvaged information includes specifications of a combat caliber similar to Chamber. Meanwhile the warring inhabitants of the continent have made a discovery of their own, one with which they want Ledo's assistance.