Akio Hoshigami's dream of becoming a track-and-field star ends when a leg injury forces her to give it up. Set in 2006, the story picks up as she starts high school alongside her friend Ayano Umisoe. Through new activities and new friendships, Akio slowly begins to act like her old self again. Then, one day, Ayano suddenly disappears. The film blends action, mecha, romance and science fiction.