Summary: In the distant future, mankind has taken to the stars and formed the Galactic Alliance of Humankind. The Alliance is currently engaged in a genocidal war with a plant-like alien species called the Hideauze. 16-year-old Ensign Ledo is a soldier for the Galactic Alliance, piloting a Machine Caliber, an AI-automated, humanoid-shaped battle suit, which he refers to as 'Chamber'. After a failed attempt by the Alliance forces to destroy an enemy super-weapon, Ledo is knocked into a wormhole and loses consciousness. When he awakens, he learns from Chamber that he has been in cryo-stasis for 6 months while his wounds were healing. Ledo learns that he and Chamber have been 'found' by a rag-tag band of 'primitive' human scavengers. Escaping, Ledo quickly discovers that he is on board a massive floating ship on an ocean covered planet. Chamber tells him that local star charts reveal the planet is Earth, the birthplace of humanity, a place members of the Alliance only knew of in stories and believed was a myth.
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Bit late doing all this. Anyway, so far I like the anime, but I think I liked it more when Ledo didn't know shit.
Spoiler: show
Edit: Also, tits.