First-year high school student Aoba Watase returns to school after summer break and finds himself attacked by a mysterious robot.

Aoba finds himself in a strange cockpit alone, thrust into the middle of a furious firefight over 70 years in the future.

As Aoba tries to come to grips with the new world he finds himself in, the ship comes under attack again, and during the engagement, he unexpectedly comes across someone he knows.

Aoba faces the consequences of his rash actions during the combat when he saw Hina; the Cygnus lands at Narashino; Aoba gets a chance to explore his hometown to see what became of it after the last 70 years.

Aoba finds out more about Dio and his family; Cygnus unexpectedly finds itself mobilizing against an invading Zogilian force.

To defend the existence of the Cygnus and the Coupling Valiancers against outraged politicians, a film crew arrives to make a promotional video rallying popular support.