Zero is accused of Shizuka Hio's murder and becomes the target of the Senate. When Kaname refuses to attest to Zero's innocence, Yuki's loyalties are torn between the two. Then Yuki meets a mysterious little boy whose seemingly innocent kiss on the cheek draws her deeper into the world of vampires. Zero, seeing Yuki struggle to recall her past, tries to help. Do the archives of the Hunter's Society headquarters hold the key that will unlock Yuki's memories?