Maaka Karin<span> comes from a family of vampires living in Japan, but she is not a normal vampire. Vampires are normally supposed to drink the blood of their victims... but Karin suffers from a condition that causes her body to produce excessive amounts of blood.</span> <span>About once a month, she has to get rid of the excess blood by giving it to her "victims". But she somehow manages... and goes to school like everyone else her age.</span><br /><br /><span>Well, things are about to get more complicated: When a new student, </span>Usui Kenta<span> transfers into Karin's class, she starts producing unusually huge amounts of blood, almost as if in reaction to him. Worse, he happens upon Karin's... true nature...</span>