Sennen no Yuki

Seventeen-year-old Chiyuki Matsuoka was born with heart problems, and her doctors say she won't live to see the next snow. Touya is an 18-year-old vampire who hates blood and refuses to make the traditional partnership with a human, whose life-giving blood would keep them both alive for a thousand years. Note: Author decided to go on hiatus from series for Ouran Koukou Host Club. Sennen no Yuki went on hiatus after chapter 9 was released in LaLa 2002-05 issue and a special chapter titled Chikai no Hi (誓いの日) was published in LaLa DX 2002-07 issue, which was later collected in volume 3 as chapter 10. The series resumed publication ten years later with chapter 11 in LaLa DX 2013-01 issue. (From MyAnimeList)