In a world where famous racehorses are reborn as athletic 'horse girls,' Oguri Cap dreams of becoming a champion racer despite her unorthodox style.

Rud raids the treacherous labyrinths, uninterested in fabled riches but desperate to cure his sick sister. Kicked out by a conceited hero, Rud heads home empty-handed until he rescues a girl who exposes his unparalleled protection.

Two orphans raised as brothers become rivals as they vie for the title of Wizard King, the highest magical rank in the land.