Yasunaga (安永) is the tennis captain at To-Oh University.
Yasunaga has short brown hair and black eyes. He wears a pair of glasses that have a yellow-colored lense.
While chatting with a couple of girls, Yasunaga is made aware of Hideki Ryuga and Light's tennis match by a teammate. He initially heads over to stop the two freshmen from using the courts without permission but changes his mind once he sees how good they are. He becomes determined to recruit them both to the tennis team.