The Princess of Darkness.Zero remembers telling his twin brother Ichiru Kiryu to flee after Shizuka’s attack. Maria tries to touch Yuki, but Zero pulls Yuki out of her reach. Zero begins to tutor Yuki to help her with her exams, and Zero reveals that Yuki is the only reason he is alive. Maria talks with Kaname, who knows that she is not Maria. Later, Zero goes to the old dorm while Yuki secretly follows him. He attempts to kill Maria, but is unable to pull the trigger because she is really his master, Shizuka in Maria's body. She attacks him causing him to pass out from blood lose. Kaname erases Yuki's memory of the incident, and Maria has her companion take Zero away. The following day, Yagari is angry that Kaien allowed Maria in the school. Kaien comments that Kaname told him to admit Maria and that the Vampire world has its own way of dealing with things. Kaname and Takuma visit Yuki to see if she remembers the events from the night before. Later, Maria unlocks Yuki's memory of Zero's fight and makes a deal with Yuki to save Zero from becoming a Level E vampire. Meanwhile, Zero recalls as a child that he discreetly sensed Shizuka as a vampire during the day when Ichiru was unaware of this. When Shizuka suddenly appeared at night and attacked Zero's parents, Ichiru was standing next to Shizuka smiling. Zero awakens and greets Shizuka's companion, who he knows is Ichiru.