A former NEET enters a space war that will decide the fate of the Earth! Ayato, a former NEET, has grown into an ace pilot for the Alliance. However, the battle with the Empire continues to worsen, and eventually Earth becomes a target for the Empire's invasion! Ayato fights to the death to protect Earth. Meanwhile, Mai Kisaragi, the love of Ayato's life, who fights as a commander for the Empire, also throws herself into the battle to protect Earth. Without realizing that they are enemies, they finally face off in a one-on-one battle! What will be the fate of Earth, and of these two people...?!