School: Seishun Gakuen Chuugakkou
Grade: Year 1, Class 2
Birthday: 9/20
Height: 151cm
Dominant Arm: Right
Family: Older brother Junpei (21)

Horio has two years of tennis experience and he consistently and loudly brags about his knowledge of tennis. But for a guy with such a big mouth, Horio does not have the goods to back up his words: he needed Echizen Ryoma's assistance in several tight situations. He and Echizen are in the same class. Horio's two best friends are Katou Kachirou and Mizuno Katsou. They are not regulars yet, but they always cheer on Seigaku!