Amago Vaccine is a thoroughbred racehorse and a major rival to Midori Makibao and Superhorse Cascade, forming a celebrated trio known as the three top horses of his generation. He is the full younger brother of the legendary dual-crown winner Peter II, who was forced into early retirement due to injury. Carrying the weight of his brother’s legacy, Amago Vaccine initially struggles with a lack of self-confidence and suffers a string of defeats. After his injured brother entrusts him with the unfulfilled dream of winning the Triple Crown, he gains a new sense of purpose and sets his sights on toppling the dominant champion, Cascade. Beneath a calm and composed exterior, he possesses a fierce and indomitable fighting spirit, occasionally venting his frustration in private, such as by pounding his head against a wall after a racing accident. A fracture caused by an accident on the track forces him to miss the Japanese Derby, but he makes a comeback and achieves his greatest triumph in the Kikuka Sho, a long-distance race on the flat tracks of Kyoto where he finally defeats Makibao to become a G1 winner. His key relationships include his brother Peter II, his jockey Yamanaka Mabonosuke, and his rivals Makibao and Cascade. Later in his career, he competes internationally in Dubai. Amago Vaccine transforms from an insecure horse into a confident champion, though tendonitis eventually forces his retirement, and he later passes away. His most notable ability is exceptional stamina for long-distance races, earning him the nickname Magician of the Pace for his mastery of ever-changing tempo from an early lead. He is a heavy horse troubled by inclines, performing best on flat, straight tracks like those at Kyoto, but his finishing speed is somewhat inferior to that of Cascade or Makibao. His bloodline, like his brother’s, is prone to leg issues.