When the missing Zero Kiryuu returns to Cross Academy, Yuuki Cross feels relieved to see him safe, yet she notices that Zero has changed in more ways than one. Due to choices he made, Zero is haunted by visions, and he tries to uncover the reason behind them—unaware that the answers may be much closer than he thinks. Soon Yuuki also begins to be tormented by ghastly hallucinations, and she seeks an explanation about her shrouded past from the only one who can provide clarity: Pureblood vampire Kaname Kuran, who is closest to her heart. But what will happen when the truth is finally revealed?