The anime takes place in 2006, and centers on Akio Hoshigami, who due to a leg injury is forced to give up on her dream of being a track-and-field star. Akio and her friend Ayano Umisoe move on to high school together. Amidst new activities and meeting new friends, Akio gradually starts acting like herself again. Then one day Ayano suddenly disappears. 
 
(Source: Anime News Network)

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.
 
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.
 
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.
 
A yuri mecha movie starring two girls bound together by a bond far stronger than friendship.

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