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Fuyune, Akioto, and Natsune. Three sisters involved in horse racing and their beloved horses aim for the dream of the "Japan Derby"!! Horse racing can be so "exciting"!! A new racehorse is born at the ranch of the three sisters who love horse racing and racehorses. They name the racehorse "Shikio", and the three sisters dream of winning the Japan Derby. Time passes, and Fuyune becomes a trainer. Akioto becomes a ranch manager. And Natsune becomes a jockey, and they work hard to pursue the dream they entrusted to their beloved horse. However, Shikio, the important one, lives a simmering day after day as a "racehorse that has given up on winning". A horse racing story about three sisters chasing their dreams begins!! (Source: Kodansha, translated)