In 2079, the world's first orbital elevator was constructed in the Pacific Ocean to commemorate the peace humanity regained following the Third World War. However, during the completion ceremony, a massive red humanoid entity emerged from outer space. It proved so powerful that humanity's resistance was futile. The orbital elevator was seized, and since then, mankind has been engaged in a war against the hostile red flying object known as "Vacant," which operates from that location. Summer 2099. "It's been 20 years since the war started." Humanity developed the seventh-generation humanoid fighter, the "Seventh," and succeeded in containing "Vacant" to the vicinity of the orbital elevator. At the Yashima military base, floating in the Pacific Ocean, Miku, a woman from the special technology research department, pilots the black forward-wing Seventh F/SX-02 Tenra through the blue sky. She flies alongside the personality data of Liza, a girl who was once separated from her, which is stored in the machine's computer. Just to be together. A yuri mecha film starring two girls bound by a connection far stronger than friendship.