VAMPIRE KNIGHT IS A SHOW ABOUT A BUNCH OF SCHOOL KIDS. THE KIDS ARE DIVIDED INTO A DAY CLASS AND A NIGHT CLASS (THE NIGHT CLASS KIDS ARE VAMPIRES. SHHH! IT'S SECRET!). THAT'S ABOUT IT.
IT ALSO SUPPORTS INCEST, BUT SHHHH THAT'S KIND OF A SPOILER

CHARACTERS FROM VAMPIRE KNIGHT IN CLDR:

YUKI CROSS
ZERO KIRYU