The Dark Horse of 2-C, Asou Hiroyoshi is often seen together with Suga, his best friend. An athletic student, his favorite sport is basketball. He is slated to become the next captain of the boys' basketball team, and was the coach of the girls' team as well. He also excels at track events and hockey.

Asou is reputed to be popular among girls, although this is not explicitly shown. He, on the other hand, does not appear to have much interest in girls with the exception of Mikoto, who he dated several times. Their relationship progressed to the point of Mikoto's parents inviting him over to a family dinner. The two have since broken up.

Asou's family runs a ramen shop. He is good at cooking Chinese food and works part-time at a Chinese restaurant together with Sarah Adiemus of 1-D.