While imprisoned in a spaceship, Futaba encounters a mysterious life form named Kyu-chan and they begin to act together. Meanwhile, on Earth, the "Rebellion" begins its guerrilla warfare against aliens in the Shibuya Mission. Segami, nervous about using unfamiliar equipment and firearms, receives the secret weapon "Tsuyokunaru" from former SAT member Sumeragi and heads to the battlefield.

Futaba faces off against a squad of alien soldiers to protect her new friend. Facing heavy losses, Segami and the Rebellion turn to their secret weapon.