Volume 1

At the beginning of the volume, Rushella Dahm Draculea has woken up from a long sleep, and is wondering, looking for people to feed on. She then lays eyes on Hisui Kujou, a highschool student who happened to be walking on a peculiar path on his way home. She then steps in front of him and bites him, sucking his blood. But to her surprise, he doesn't transform. Shocked at the fact that he never became her servant, she than follows him around, trying to understand how this is possible. She then uses Mystic Eyes, but still fails. While testing her powers on a cat, she realizes she is not doing anything wrong, then turns to Hisui, but sees that he has escaped.

Hisui is back home, but is found by Rushella through the help of dogs. Although refusing to let her in, she forces her way through blackmail. Luckily, he has prepared and uses garlic powder to knock her out. When he wakes up though, Rushella is sucking his blood again. Once he grows desperate, he uses sunlight by drawing the curtains. But she survives. After a quarrel with her, Hisui notices he is late for school. He changes quickly and runs, leaving Rushella to take care of the house.

Introductions are in session in Hisui's classroom over at Seidou Academy. Until it is interrupted by a school administrator, who mentions there is a late entry transfer student entering the classroom. To Hisui's shock, it is Rushella. Turns out she used her Mystic Eyes on the school principal and became a transfer student. Rushella's presence is the beginning of Hisui's problems though. Thanks to her being here, everyone in the classroom is now aware that she is staying at his place, and to make things worse, they think that they have a relationship. Hisui's hopes of having a peaceful life are dashed.

Even when he tries to avoid her, Hisui cannot keep himself away from Rushella, who is always following him, acting as if he is her servant. Then he grows suspicious of her, believing that she came to prey on the students here as well, but these suspicions are cleared. While talking to her, Hisui learns that Rushella has suffered memory loss. She uses this as a chance to blackmail him into serving her. As she tries to then suck more blood from him, he is walked on by Sera Reina, a classmate of his, and some of her friends. This leads to more misunderstandings, but the worst is yet to come.

A few days later, Hisui receives a note, telling him to go to an abandoned classroom. He goes without Rushella, but is cautious. When entering, he sees Mei Sudou, another classmate. Mei then tries to seduce him but fails. This causes her to blurt out the fact that she knows who Rushella really is. In the process, Hisui learns that she is an artificial human, created through many different genes the way Frankenstein created his monster. After a Frankenstein lesson, Mei tries seducing Hisui again, nearly raping him but Rushella interrupts. She too knows of who Mei really is. When Hisui gets tired of all this, he yells in exasperation, hurting Rushella's feelings in the process. She then runs to his house.

Hisui later gets home, noticing Rushella has passed out (Vampire's weakness of holy water and sea water). He helps her get fresh while she is asleep and explains everything when she awakens, then offers her some blood. They then have a discussion, where Hisui talks of Miraluka, his foster parent. He then mentions she was a 'True Ancestor', one of twelve. Later, Hisui goes over to a cross, where he begins conversing with Miraluka in his head. The next day begins in Hisui's new regular manner.

Back at Seidou, Mei and Rushella are preparing for another argument, but they avoid it in order to act mature, and everyone decides to go home. As the two homemates walk home though, they end up in an argument. This leads to a separation. During this separation, Hisui is kidnapped, and then tortured as if he were a vampire. Learning from Eruru Kariya that this was all for his 'protection', he snaps in anger, but takes this time to learn more about her in secret by playing dumb. He learns that the department she works for, "Supernatural Investigations", found out who he was through Mei and they know about Rushella. But he knows a dark secret about Eruru as well, though it is not disclosed yet. When it all ends, Hisui is driven home by Kishida, the man who kidnapped him, though it is not known if he was a part of the torture. He also gets some handy information, which will help him later.

The next day, as Hisui is walking with Reina, she is suddenly attacked. It is noticed she was bitten by a vampire. She accuses Rushella, who was watching them, of doing it. In order to see if it is true, Mei recovers a sample of Rushella's bite marks, which are sent to the police to test Reina's claims. Rushella is found guilty, so Hisui has to turn her over by nightfall. Hisui then questions Rushella to understand what she was doing. She tells lies to get past him, but he doesn't buy it. That being said, he needs to know the truth. But the police come for her by nightfall anyway. This is when Hisui exposes the truth. He tampered with the evidence, proving that Rushella was innocent. Then he deduces that Kishida was guilty. This is true, and Kishida reveals his identity as a vampire. Afterwards, he attacks Hisui, believing he too will become a vampire, but due to his constitution, he avoids transforming. Kishida runs. Then Hisui reveals to Eruru that he knew she, like Kishida, was not human either. She is a dhampir, a hybrid between human and vampire. He also tells her of his constitution. Once Mei returns to help, the three teenagers and the police work together with Rushella to take Kishida down successfully.

The next day, Hisui awakens in a hospital bed. He and Eruru talk about the heart he has and the surgery he received. He tells her the truth about everything. Then he and Rushella have another awkward moment. After he recovers from his injuries, he receives a startling revelation. Rushella has started a club, Eruru has enrolled in Seidou Academy to watch over them and Mei is a part of all this. Hisui has been forced to join by Rushella. Seeing all this, Hisui knows it will be a long while before he ever lives a 'normal' human life again.