Hiyoshi is a 2nd year from Hyōtei Academy whose favorite saying is "Gekokujo," which means to out do and/or surpass a senpai or upperclassman. He proved to be capable of living the phrase to its fullest. He is a strong player who specializes in "Enbu Tennis". It is confirmed by Keigo Atobe that he is to be the new captain of the tennis team once the 3rd years have graduated during their match at the U-17 camp. His childhood friend is Chōtarō Ootori. Hiyoshi is the only character known to wear contact lenses.