In 2079, the world's first orbital elevator was built in the Pacific Ocean to commemorate the peace that mankind regained after the 3rd World War. However, during the completion ceremony, a huge red humanoid object appears from outer space. It was so powerful that mankind was defeated in vain resistance. The orbital elevator was occupied, and since then mankind has entered a war with the red hostile flying object "Vacant" flying from there. <br><br> Summer 2099. "It's been 20 years since the war started." Humanity developed the humanoid 7th generation fighter "Seventh" and succeeded in suppressing "Vacant" to the vicinity of the orbital elevator. <br><br> Yashima military base floating in the Pacific Ocean. A woman who belongs to the special technology research department, Miku, drives the black forward wing Seventh F/SX-02 Tenra and flies in the blue sky. Together with the personality data of Liza, a girl who was once separated, stored in the machine's computer. Just to be together. <br><br> A yuri mecha movie starring two girls bound together by a bond far stronger than friendship.