Yuki Cross patrols the boundary between Cross Academy's Day Class and its secret Night Class, a cohort of vampires led by pureblood Kaname Kuran. Kaname is the same person who saved her from a vampire attack ten years ago and left her with no memory of her life before that night. Her fellow prefect Zero Kiryu despises all vampires, but a hidden bite mark on his neck threatens to unravel the fragile coexistence the academy was built on.