Vampires exist within society, lurking in its underbelly. While they do not need blood to survive, intense emotions can drastically heighten their bloodlust, transforming them into uncontrollable monsters. Tsukasa Taira, a 22-year-old university student, discovers the existence of vampires when her long-time friend reveals his true nature following a tense confrontation with Yuuki Anzai, a human-vampire hybrid. After her friend is arrested, Tsukasa finds herself drawn to Anzai, who reluctantly returns her feelings. However, this unconventional romance may prove difficult to sustain, as Anzai struggles to suppress the part of him that desires to devour Tsukasa.