The story begins in the distant future in the far reaches of the galaxy. The Human Galactic Alliance has been constantly fighting for its survival against a grotesque race of beings called "Hidiaazu." During an intense battle, the young lieutenant Ledo and his humanoid mobile weapon Chamber are swallowed up into a distortion of time and space. Waking from his artificially induced hibernation, Ledo realizes that he has arrived on Earth, the planet on the lost frontier. On this planet that was completely flooded by the seas, people live in fleets of giant ships, salvaging relics from the seas' depths in order to survive. Ledo arrives on one of the fleets called Gargantia. With no knowledge of the planet's history or culture, he is forced to live alongside Amy, a 15-year-old girl who serves as a messenger aboard the Gargantia fleet. To Ledo, who has lived a life where he knows nothing but fighting, these days of peace continue to surprise him.
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(Source: Anime News Network)

Episode 1 - Castaway

Episode 2 - The Planet of Origin

Episode 3 - The Villainous Empress

Episode 4 - The Flute of Recollection

Episode 5 - Calm Day

Episode 6 - Festival

Episode 7 - A Soldier's Fate

Episode 8 - Separation

Episode 9 - Deep Sea Secret

Episode 10 - Island of Ambition

Episode 11 - Supreme Ruler of Terror

Episode 12 - Moment of Decision

Episode 13 - Legend of the Verdurous Planet

Episode 14 - Abandoned Fleet

Episode 15 - The Oracle's Altar

Production I.G

Bandai Visual

Yomiuri TV

Lantis

Viz Media

Nitroplus

Bushiroad

Hanabee Entertainment

Manga Entertainment

Gargantia on the Verdurous Planet