This is a tale of a world where "horse girls" with glorious names and incredible running abilities live alongside humanity.
Horse girl Special Week has moved from the country to the city to attend Tracen Academy. There, she and her classmates compete to win the Twinkle Series and earn the title of "Japan’s #1 Horse Girl."
Special Week begins training with Spica in order to raise her chances in the Japan Derby. The Trainer has an idea for Special Week that could help her out.
Special Week starts training even harder to prepare for the Japanese Derby. Her rivals, El Condor Pasa and Seiun Sky, are training hard, as well. Suzuka also tries to help Special Week get even stronger.