The members of the Takashiro family share a terrible curse - they have a thirst that only human blood can slake. Sent away after the death of this mother, Kazuna Takashiro has long been blissfully unaware of his 'condition.' When Kazuna's teenage hormones begin to rage, his uncontrollable bloodlust suddenly rears its head...<br><br>(Source: Tokyopop)

Kazuna's family has a history of suffering from a disease that creates an uncontrollable vampire-like thirst for blood. Knowing none of this, Kazuna was sent to live with the Eda couple as a child. As the sickness begins to show signs of being present within himself, he comes into contact with his older sister, Chizuna, who has been suffering from it since early childhood. Knowing that the sickness incurs a heavy weight upon those that suffer from it, Chizuna tries to ease her brother's burden, to help him learn to control his urges, but...
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(Source: Anime News Network)

Natsuko Eda