リコリスの刻印

A girl often dreams about myriads of silver-white Lycoris in full bloom. One day, on the way home with her older brother-like relative, Tomoyuki, she encounters an accident in the subway station. Amidst the chaos, she witnesses a commotion between a vampire with eyes in the color of the blood red ruby, and a fox spirit. Without any warning, the two start to lay claim to her. Tomoyuki struggles to protect the girl, but his powers as a human are futile against the mythical beings.

When the crimson full moon rises, the girl shall learn about her past, her fate, and the meaning behind the symbol on her chest. Who is the owner of the voice who keeps on appearing in her dreams?