Birthday: May 5
Birthplace: Tokyo
Height: 174 cm
Weight: 60 kg
Blood type: AB
He is Haruto's classmate and friend who cherishes the exhilaration brought by riding his motorcycle. He afflicted by an unspecified illness which prevents him from fulfilling his future aspiration to race professionally.
After moving to Tokyo, he and Asuka are the first friends that Haruto finds and the three of them become extremely close, similar to the relationship Haruto has with Takashi and Akari in Hiroshima.
As of chapter 89, it is revealed that he is Eba's current boyfriend, despite wanting to help Haruto win his girl back. After learning the truth, Haruto questions her motives and why she dumped him back then, and she tells him that she knew Kazama since middle school, but after Kazama confessed his love to her, she rejected him multiple times and moved to Hiroshima. After she moved back to Tokyo, Kazama confessed his love to Yuzuki to her again, only this time he revealed that he doesn't have much left to live, and wants to spend the little time he has with Eba.
He chose to take a risky surgical procedure, thinking that if he can live longer he can still spend more time with Eba and prove to Haruto that Eba will still choose him. But even though the surgery was successful, his body cannot handle it and he dies shortly afterwards.
Haruto wonders whether the fact that he and Kyousuke were competing for the same girl had actually ruined their friendship shortly after his death and wonders whether Kyousuke actually didnt like him deep down inside. But at the funeral, Kyousukes mother gives Haruto Kyousukes helmet, which she says he would have wanted Haruto to have. On the helmet a sticker is placed on the forehead, saying space reserved for Harutos restaurant and Haruto realizes that Kyousuke thought of him as a true friend as well.
After Kazama's funeral, Eba, perhaps feeling guilty about inadvertently contributing to his death, tells Haruto that it is best that they never see each other.
