Ako finds a tragic scene that her parents were brutally murdered by a vampire Koh. Ako is also attacked and sucked her blood by Koh. But, at the same time, she also writhes with pleasure? Ako wakes up in Ko's place after the ??, she realizes to become a vampire. Her body can't deny the strong desire of blood sucking and Ko orders her to attack humans.... Ako's only brother Yuya was waiting for her return but another villainous vampire Yui contacts Yuya for a malicious purpose....
