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

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.

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.

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.