Yui Komori's father, a priest, is assigned to Eastern Europe and leaves her behind in Japan. She seeks refuge in the mansion of her distant relatives, whom she's never met. Upon entering the dimly lit house, she finds a motionless stranger on the sofa. As she approaches him, she discovers he's not only handsome but also cold to the touch with no pulse. Suddenly, the stranger springs to life with sharp fangs and demands compensation for being awoken. Yui attempts to escape but screams, attracting the attention of the mansion's other mysterious inhabitants - all vampires.
The Sakamaki brothers - Shuu, Reiji, Ayato, Kanato, Laito, and Subaru - are merciless, and Yui struggles to free herself from their grip. She decides that she should have a say in who indulges in her blood, which gives the brothers pause. However, Yui questions whether any decision she makes will just be a concession to their predatory nature, as they all long to sink their fangs into their prey.
