A girl finds herself in a house full of bloodthirsty vampires. Unable to escape and with traditional anti-vampire weapons being useless, she becomes lost within the labyrinth of hallways.

After being told to behave or face certain doom, Yui is coerced by Ayato to skip class, and she submits to his every whim.

Yui Komori wakes up to realize she's in Mukami's mansion. She was taken by the brothers and is told she is to live there with them. The Mukami brothers need Yui for their "plan" and call her "Eve.

After the Sakamaki brothers along with Yui recently experienced a car accident, the cause of it was four new vampires that where non-pure bloods who want Yui for her blood

Yui returns to Mukami's mansion along with Azusa. There, she finds a badly injured Ruki lying on the bed. He's been injured to save Azusa. Kou, Yuma, and Azusa explain to Yui the reason Ruki has been acting strange lately.

Yui, still intent on escaping the horrors of the mansion, learns a shocking truth from one of her oppressors.

After getting her blood sucked by Ruki Mukami, Yui Komori wakes up in her own room the next day. She enters the living room where the 4 Mukami brothers are enjoying dinner together. They leave for school telling Yui to stay with Azusa.

Ruki has been secluded in his room lately and his brothers have noticed his change in behavior. Ruki suddenly appears and takes Yuito the basement room. There, Ruki feeds on her blood and Yui blacks out.

Ayato has claimed Yui as his own and is furious to discover the bite marks of another. He confronts the culprit and a game of darts will decide who Yui belongs to in the end.

Yuma takes Yui to a garden where he grows vegetables. Yui asks his purpose for growing them if vampires don't need to eat food like humans. he begins to talk about his and the Mukami brothers' past

After the Mukami brothers were attacked by wolves, the Sakamaki brothers are attacked as well. They fight off the wolves. The Sakamaki brothers reach a conclusion that the Founders are behind the attacks and they're after Yui Komori.

A mysterious woman gives Yui a chance to look into the past, when Ayato and his brothers were young boys.

Yui seeks out Shu to ask him about the sudden chest pains she is experiencing, but instead she learns more about her later father.

Cordelia and Richter are reunited once again. Ayato demands to know what has happened to Yui.

A fight breaks out between the boys and Richter, and while Ayato proclaims Yui to be his, Richter brandishes a knife.

Ruki starts feeling impatient when Kou and Azusa they confirm they don't have any signs of the awakening. Yui trips on the school stairs due to lack of blood, but is saved by Yuma. On their way to the nurse's office, they run into Shu

Kou gives Yui roses as a gift. Yui is confused when Kou demands something in return and suddenly changes Kou feeds on her, Kou later returns asks Yui to help him Yui goes to his room and discovers multiple scars on Kou's

Ruki suddenly allows Yui Komori to attend school. she reunites with Kanato, Laito, and Reiji but they disappear without a conversation. Walking alone, Yui is grabbed by Subaru and is dragged to the rooftop. Kou appears there as well

Yui wakes up in her room in the Sakamaki mansion where Laito feeds on her but Reiji interferes and tells Yui to come to the living room. In the living room, Reiji asks about the Mukami brothers and Yui tells him all she knows

Yui resists while Shu takes her blood and this makes him crave it even more. Kou, Yuma, and Azusa are baffled about Ruki allowing Ayato to take Yui. As they try to question Ruki on his intentions, a pack of wolves invade their mansion.

Yui continues to struggle adjusting to life with the vampire brethren. Subaru grants her desire to flee, but something is keeping her there.

Amid Yui's growing concern for her safety, the boys uncle appears, and shows her the reason she has stayed alive this long.

More information is revealed to Yui about the brothers' past, even as she endures her life's blood being drained by two of them.

The struggle between Yui and Cordelia for control over the body comes to a head. The boys hatch a plan to get rid of Cordelia for good.