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.

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.

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

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

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