In isolation his entire life, Nagate must adjust to life in a centuries-old space colony while training as a cadet pilot to fight an ancient threat.

Nagate is haunted by his first combat experience against the Gauna. Later, he meets the elite pilots of Sidonia.

Nagate goes to the Gravity Festival.

Captain Kobayashi orders a maneuver that causes massive casualties.

Nagate and Shizuka become adrift in space.