優駿牝馬
Tokai Teio was sired by triple crown winner Symboli Rudolf. Tokai Teio's dam was Tokai Natural, the half sister of Yushun Himba winner Tokai Roman. Because Natural had foot problems, she could not debut and became a brood mare. Natural and Roman's owner Masanori Uchimura had obtained the breeding right to Symboli Rudolf and originally planned to breed him with Roman. However, Roman, who was supposed to retire after the Niigata Daishoten, placed second, and it was decided that she would race for one more year. Natural was bred with Rudolf instead.