Yuki Kuran/Plot summary

Shizuka Hio
Following her discovery of Zero's awakened nature as a vampire and his subsequent struggles with blood lust, Yuki chooses to go against taboo and allows Zero to feed upon her in secret. In order to prevent Zero running away, Yuki promises that she will be his ally and that she will kill him if he becomes a level E vampire. Yuki then meets Shizuka Hiou disguised as Maria Kurenai, who offers to allow Zero to drink his blood, thus preventing him from falling to level E, in exchange for either Yuki's blood or Kaname's life. After dancing with Kaname during the inter-class ball, Yuki decides that she cannot kill him, and that she will instead let Shizuka have her blood. However, Zero stops Shizuka from biting Yuki, saying that he does not want Shizuka to take anything away from him.

Yuki's secret history
Troubled by the gap in her memory, Yuki attempted to ask Kaname to reveal what he knew. Kaname bargained the answer in return for her becoming his lover. Yuki admitted she loves him and agreed to his proposal, but when she didn't get an answer, she attempted to remember on her own, causing herself waking nightmares, at one point almost suffocating Zero. Kaname then bit Yuki and re-awakened her as a pureblood vampire and drinking his blood brought back the complete memories of her past. Yuki was reunited with Kaname as his sister and his betrothed.

Returning to her vampire self, Yuki exhibited the uncontrolled return of her vampire powers return and physical changes also occurred. Yuki chose to break her friendship with Zero, aware of the new antagonism between them, however Yuki retained her friendship with her best friend, Yori. Yuki began to sense the danger of Rido's revival and Kaname attempted to remove her from danger. Yuki refused to leave the school, but convinced Kaname to continue his own mission. Yuki's ignored the Artemis Rod's attempts to reject her vampire nature until finally it morphed into a new weapon as a scythe.

Rido's return
Yuki finally confronted her uncle, Rido and saves Aido from him, but she is shaken by Rido confusing her with her mother. Zero interrupted them by attempting to kill Rido. Yuki reconfirmed her vow to be Zero's ally despite being called his enemy. Though Zero attempted to remove her from the fight, Yuki managed to score the killing blow on her uncle. When Zero announced his intention to kill all purebloods, including Yuki, she decides to defend herself. Both fail to attack and Kaname interrupts their confrontation. Yuki prevents Kaname and Zero coming to blows and Kaname leaves.

Yuki confirms she is the same person she has always been and tells Zero that she only desires Kaname's blood. Zero confesses that he only desired her blood, and she allows him to drink her blood again. Zero reiterates his intention to kill Yuki and she declares she will run from him to give him a reason to continue living.

Yuki breaks down in despair over the position she is now in as Zero's enemy and she finally realizes Zero's true feelings for her. As she cannot change what she is, she resolves to lock up her pained heart instead. She collects her things including the Resin Rose, finally recalling Kaname's promise. She later thanks Kaname for remembering the promise she forgot. She leaves the Academy with Kaname but not before seeing Zero carrying his brother's body.

Upon their arrival at the Kuran mansion through a hidden entrance, Kaname confesses all his sins to Yuki. Yuki forgives Kaname's deeds and feels guilty for being the cause of these deeds.

After a year
During the year timeskip, Yuki starves herself refusing to drink as a normal vampire, forcing Kaname to pierce his own wrist to feed her. Aido tutors Yuki in school lessons and Ruka teaches Yuki the etiquette of a noble lady. She spends much time on her own while Kaname is out conducting his affairs. She has no contact with Yori and Kaien during that time.

Yuki finally admits to Kaname that her thirst cannot be sated by his blood alone and she has been unable to sever her attachment to Zero, but desires to stay by his side. She is upset when Kaname allows this telling her he welcomes anything from her including pain. He then tells Yuki that she should drink his blood as the punishment she wanted from him. Yuki once more meets Zero at the vampire peace party, only to find him as hostile as ever, but her spirits are lifted upon once again seeing Yori. Following the suicide of a hunter who was bitten by a pureblood at the party, Yuki swears to investigate in order to protect her loved ones.

Upon questioning the death of Ouri, Kaname impresses upon Yuki the problems caused by purebloods and their failure in desiring to live. He returns the Artemis to Yuki to let her know that he was serious about his desire for Yuki to kill him, should she leave him. Yuki decides to take action and seeks out the pureblood families, offering her services as executor to any that wish to die.

During her excursion takes a side visit to the cemetery, during which Yuki is attacked by an aggressive pureblood, named Touma. Zero encounters Yuki and Aido, he takes the injured Yuki to a Vampire Hunter safe house to recover. Yuki however awakens before Zero sets her down and almost ends up biting him. An apologetic Yuki runs rushes off to find Kaname and go home.

Revelation of the ancestor
As Kaname drinks from Yuki, he admits that he returned Artemis to allow her to be herself, yet hoping that she would realise that somethings are lost causes no matter how hard one tries. Kaname's words trouble Yuki as she senses his depression and is at a loss at how to help him. Kaname admits that he fears her sacrificing herself for one of these lost causes and finally reveals that he is not her brother. Yuki is confused by his words and he carries her to his coffin and lets her drink his blood to reveal his memories of his awakening.

Yuki witnesses Kaname's past both as a watcher and participator. After awakening from his memories, Yuki is frantic to find Kaname, after Kaname assures and reminds her that its ok to call him "Onii-sama" since he took her real brother's life and took his place, she acknowledges that she understands and declares she will call him "Kaname" from now on.

When Aido-dono asks Yuki if she is able to stop Kaname should she disagree with his actions, Yuki realises that she will not be able to do anything until she is Kaname's equal, she realises they still have a lot to talk about. She realises that in the past, while she loved Kaname from a far there was always a distance between them and she thought she would have time to address it, but then everything she wanted was suddenly hers. Her vampire self chides her, declaring that if she wants Kaname, she should devour him. Yuki berates the honesty of her inner self, her thoughts are interrupted when Yuki witnesses an upset Ruka and runs to Kaname to confront him over the cause. Kaname answers enigmatically and Yuki notes he still has more secrets.

Yuki has trouble refering to him as just Kaname and Kaname offers to let her change his name. As Kaname prepares to leave, he gives Yuki a mysterious key and then asks Yuki how she sees him. She answers that he was proud of him as her brother and her senpai, finally she knows him as her ancestor. He is like her, a beast inside a beautiful man, but he's also weak, shady, a liar and has too many secrets. Even though they promised to marry since they were children, she's not certain of his feelings for her, she amends that he loves her but there are various things mixed up in it. She asks if they can start over again and so she can watch him anew. Kaname agrees.

Kaname's departure
When Kaname tells Yuki he has to go, Yuki senses something is wrong and begs him to stay. Kaname declines and leaves her behind. Yuki, frantic and upset, sets out to find Kaname. She reaches the train station and finds Kaien, she hijacks them and leads them to Kaname who is at the Hanadagi estate. They arrive in time to witness Kaname killing Aidou-dono. Kaname tells Yuki he has decided to carry out his plan, he apologises and thanks her and then flees. Yuki is shocked while Kaien chases Kaname as she watches Hanabusa grieve, she runs out after Kaname wanting to know the reason for his actions after they had agreed to start over. She finds Kaien and desperate to understand why Kaname has left like this, her pureblood power of butterfly wings develop. Kaien stops her before she can go any further and she finds she can no longer sense Kaname. She meekly returns with Kaien to the Hunters Headquarters, detained by him as per the law.

Yuki returns to the Hunter's HQ and is interogated by Kaien. She cannot provide any answers, but requests that the Hunters do not interfere in her finding Kaname and asking him his reasons. Kaien advises her that she will need to take on the duty for upholding the treaty that Kaname created in order to prevent certain chaos again. Yuki advises Aido that she will take responsibility to find out Kaname's reasons. Yuki smells blood and finds Kaito carrying a catatonic young girl, when she touches the girl, Yuki absorbs the memory of the girl's kidnapping and subsequent savings by Zero and witnesses Zero struggling with bloodlust and the girl is healed by Yuki's actions. Yuki returns to the Kaien's office and requests that she punish the vampire that escape Zero to prove herself, not as a "Kuran", but because she wants to prove her ability to take action. After Kaien agrees, she promises herself that she will definitely go after Kaname, but she must do this first.

The New Nightclass
Yuki catches the vampire who has been kidnapping human children, but Zero says that she wouldn't be able to catch all of them. Yuki with Kaien's permission seeks out the support of the former Night Class students, she goes to the Noble and asks for their permission to recreate the Nightclass and join her in enforcing the treaty. They agree once Aido also agrees to support her and expresses his trust that she will not use her pureblood powers against them.

The students return to Cross Academy and Yuki establishes herself as the enforcer of the rule they are not allowed to harm humans. Yuki talks to Zero expecting that he is against the Night Class, she later notes that she had asked Kaien not to use Zero because she feared he was falling to Level E after a bout of bloodlust and expresses doubt that he still desires her blood. She later overhears Zero and Kaito discussing trouble in the town, she takes a group of Night Class kids to town to assist the hunters in dealing with the troublemakers.