Hitsuji no Uta

The members of the Takashiro family share a terrible curse: only human blood can quench their thirst. Sent away after the death of his mother, Kuzuna Takashiro remained blissfully unaware of his 'condition.' When Kazuna's teenage hormones begin to rage, his uncontrollable bloodlust suddenly rears its head...

(Source: Tokyopop)

Hitsuji no Uta was published in English as Lament of the Lamb by Tokyopop.