The T-Head Trainer, also known as the protagonist or main character, is a rookie trainer who enters Tressen Academy and joins a team as a sub-trainer. He is greeted by an elderly woman who is the chief trainer and introduced to Mejiro Dober. The trainer supports Dober, who is overtraining, and reassures her that she is not alone, building confidence in her abilities. In the game's core gameplay, the player takes on the role of this trainer, raising and training Umamusume characters to compete in races and achieve their goals.