Boyish high school girl Tomo Aizawa finally manages to tell her childhood friend Jun that she's got a crush on him. Unfortunately, her confession goes right over his head—he didn't even realize she was a girl until middle school, and even now, Jun still thinks of her as a bro! How can Tomo-chan possibly convince him otherwise and win Jun's heart?
The story takes place at a horse-racing academy that trains boys to become jockeys. The three-year academy is very competitive: those who wish to enter must not only pass an academic test, but a physical and fitness test as well. Yū Arimura is a former popular idol who becomes enamored with horse racing after seeing it for the first time and wants to join the academy. Shun Kanami was raised on an island, and only experienced horse races through radio broadcasts growing up. Amane comes from a high-class family in England, and his father is a former jockey. Amane has previously attended horse-racing academies in various countries. The show follows these three 15-year-old boys at the academy.