Millennium Snow (Manga) Vol. 01

From Bisco Hitori, Creator of Ouran High School Host Club

One fateful night, Chiyuki, a girl born with a weak heart, meets the mysterious Toya, a vampire who refuses to seek out a human life mate. Unable to submit another person to a terrifying, unknown eternity of life, he is determined to live out the rest of his thousand years in solitude. Chiyuki, nevertheless, sees through his abrasive attitude to his kind heart, and sets out to show him that love is strong enough to survive a lifetime,
even one that lasts a millennium.