In 2020, the world is taken over by the military group GGP, armed with ultra‑modern technology. While leaders in uniform impose a new world order with an iron hand, the lives of ordinary people continue as usual. Nineteen‑year‑old Rin, daughter of famous ballerina Yuki Ogata, decides to leave the stage—a place she has lived behind since childhood. It isn"t about injuries; simply a smart and honest girl realizes that, though talented, she will never step out of her great mother"s shadow in classical dance. After enrolling at university, Rin decides to change her life. A lucky coincidence helps: she ends up under the roof of a university club whose members are mastering the Riderback—a newly appeared motorcycle‑transformer. Deciding, as usual, to ride a prototype, the unwilling rider is forced to demonstrate feats of agility and body control to finish the ride. As she acclimates to new sensations, Rin begins to understand that she can find herself again and attain the desired freedom of spirit. But is everything really so simple in the motorcycle club and student town? Where will the red iron horse, gifted by fate, take the heroine?