Track Team Captain
From Katawa Shoujo Wiki
The track team captain is a male student who leads the track team. Friendly and supportive, he cares and worries for his fellow team members, as we see during Emi's route, when she gets sick and he calls her by phone to know how she is. Yuuko also comments on how he and Emi tend to go to the Shanghai together. He is a good friend of Emi. No name nor image of his look is given. At first, Hisao sees him as a love rival, but Emi later clarifies that he is gay, though she admits that she used to have a crush on him before knowing this.
Also according to Emi, he enjoys anal sex and talks about it often.