Косукэ Кавай

He is Hibiki's best male friend. He is really hot-tempered and is deeply in love with Nakajima-sensei. When Nakajima decides to leave the school he decides to follow her and quit school. He almost assaults Nakajima and gets suspended due to that. At first, he hated Itou-sensei but begins to trust him later. He cares deeply for Hibiki and Chigusa and acts like their big brother. He is really popular for his good looks and becomes the Captain of archery club in his third year of high school.