Midori Makiba� is a small white mule. Compared to the other thoroughbred horses, his physical size comparable to a donkey with wide nostrils. However, with guts and speed as his weapons, Makiba� wins in every big race. At the beginning of his career, Makiba� has trouble making his debut as a racehorse. But he has reasons to overcome his difficulties; a lifelong rival horse called Superhorse Cascade, that Makiba� needs to defeat. Plus, he is determined to win back his mother, Midori, a horse that had been taken away to pay debts. There are many hardships that Makiba� has to overcome, but he thrives in a series of races to become a great racehorse. (Source: Wikipedia)