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Once, vampires and humans lived in harmony. Now, a young girl and a vampire queen will search for that Paradise once again. In the divided world of the future, two girls want to do the forbidden: the human wants to play the violin, and the vampire wants to see a wider world. (Source: Netflix, edited)

The OVA will be focus on when Kujaku Nijou first entering group, which occurs one year before the main anime begins.

Vanitas and Noé Archiviste head out to the town of Gévaudan in search of the "Beast," an enormous wolf-like creature that has slaughtered hundreds of people. Suspecting that the Beast is a curse-bearing vampire, Vanitas primarily aims to heal it using the powers of his grimoire. Along the way, the two get separated and suddenly travel back to the past—to the exact moment the Beast is lurking in the woods. After a battle against the gigantic wolf and a vampire hunter, Vanitas decides to team up with Jeanne in order to find Noé. Despite being allies, Jeanne's goal is the opposite of Vanitas', as she was tasked to kill the Beast—suspecting it may be someone she used to know. Meanwhile, a severely wounded Noé is picked up by the mysterious Chloé d'Apchier and her servant. Like Noé, Chloé is a vampire whose existence was erased from the public's knowledge. She has been a guardian for future generations and once tried to find a way to become human again. While Noé is grateful to Chloé for her hospitality, little does he know that she might be siding with forces far more dangerous than the Beast itself. [Written by MAL Rewrite]

Mitsugu Banba is a high school girl who finds meaning in donating blood. She frequently visits a blood bank to donate blood, despite being harshly treated by the nurse. One day, she encounters a beautiful girl who looks like she's from overseas at the blood bank. The pale girl looks like she's about to faint any minute, but then, she starts destroying the blood bank. The girl loses consciousness and Mitsugu takes her home... (Source: Official Website)