Sennen no Yuki manga info.
(A Thousand Years of Snow) Also known as Millennium Snow
Main: Chiyuki, Touya
Genres: Romance, Shoujo, Supernatural
Chiyuki is a high school student living with a heart disease that threatens to take her life at any moment. One night, she meets Touya, a vampire with the opposite problem; he will live for about a thousand years.
It’s customary for a vampire of Touya’s age to choose a human partner, one who will allow him to drink her blood and who will also share his life span. Considering long life to be more of a curse than a blessing, Touya refuses to bind a person to him by drinking their blood.
Chiyuki, not wanting Touya to be so alone, makes it her goal to convince him to make her his partner for a thousand years.