Vow of the Pureblood (純血の誓い, Junketsu no Puraido) is the twelfth episode of the Vampire Knight Series.
Yuki tells Shizuka to drink her blood in exchange for saving Zero. Shizuka agrees, telling her that if Zero drinks his master’s blood, he won’t fall to Level E. Before Shizuka can drink from Yuki, Zero comes in and pulls out his gun. Yuki shields her, telling Zero he must drink Shizuka’s blood to save himself. Zero says that he can still beat Shizuka within an inch of her life, but stops because Yuki starts crying. Shizuka is angered by Yuki’s influence over Zero, and compels him with her voice to hold Yuki still while she drinks Yuki’s blood. She first drinks Zero's blood, punishing him for liking Yuki, but he managed to stop her from drinking Yuki’s blood next. He shoots his own leg and the pain breaks his compulsion. He wounds Shizuka with the Bloody Rose, but Ichiru enters, throwing his sword into Zero's firing arm. While Zero is pulling out the sword, Shizuka tells Ichiru not to meddle and leaves. Ichiru pulls out a dagger and begins fighting with Zero. Then, Yuki jumps between them, and Ichiru threatens to kill Yuki against Shizuka's orders. Zero retaliates by pressing his gun to Ichiru's head, but Ichiru reveals that it won’t work on him because he’s still human. He becomes enraged, explaining that although Shizuka gives him her blood, she doesn't want his in return. He loves her, but like their parents, Shizuka seems to prefer Zero over him. Ichiru pushes Yuki out of the way to attack Zero. At Headmaster Cross’s house, Yagari and Cross argue again about meddling in vampire affairs. Cross insists that he cannot interfere in Kuran’s sphere, but does say that he doesn’t consider matters involving Yuki and Zero under vampire jurisdiction. Meanwhile, Shizuka returns to her room, where Kaname is standing next to the window. She asks him why he attends the academy and he replies, because he also wants someone. Kaname appears behind Shizuka and shoves his hand through her heart. She tells him that she wanted to kill him, too, using Yuki. He drinks her blood, and Shizuka says that it’s similar to the first time they met: they’re both after the same thing. He then pulls his hand out of her and lays Shizuka on the ground, vowing to destroy their mutual enemy. Aido, eavesdropping outside the door, hears everything. All the vampires smell spilt blood, and Ichiru realizes that it’s Shizuka's. He leaves to find her. Zero tries following but Yuki hugs him and says she doesn't want him to perish with Shizuka as he planned. He pushes her away gently and says it’s different now, he will come back. Ichiru has already reached Shizuka and finds her dying on the floor.
|Vampire Knight (season one)|
♦ 01. Night of Vampires ♦ 02. Memories of Blood ♦ 03. The Fang of Penitence ♦ 04. Trigger of Condemnation ♦ 05. Moonlight Festivities ♦ 06. Their Choices ♦ 07. The Scarlet Maze ♦ 08. Gunshot of Sorrow ♦ 09. Crimson Gaze ♦ 10. The Princess of Darkness ♦ 11. Consequence of Desire ♦ 12. Vow of the Pureblood ♦ 13. Crimson Chains ♦
|Vampire Knight Guilty (season two)|
♦ 14. Burden of Sinners ♦ 15. The Eternal Promise ♦ 16. The Azure Portrait ♦ 17. Devil's Awakening ♦ 18. The Subordinate's Trap ♦ 19. The Fake Lovers ♦ 20. The Kiss of Thorns ♦ 21. Spiraling Recollections ♦ 22. Revival of the Mad Emperor ♦ 23. Prelude to the Battle ♦ 24. Two Souls ♦ 25. World's End ♦ 26. Vampire Knight ♦