Keigo Kuramata

He is Chiyuki's 26 year old cousin who shares a brother-sister bond with her. He is very protective of her due to her health issues; he can also be very possessive of her. Chiyuki believes that he left for the United States to study English, but the truth is that he is studying to become a heart specialist for her sake. He tries to separate Chiyuki from Tōya. He even goes so far as to try to kill Tōya with a rock but hits Chiyuki instead.