As college student Segami struggles with his dystopian world, a hot schoolmate hands him an enticing flyer. Hoping to meet girls, he finds something else.

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.