Yui Sasame is a descendant of vampires struggling to fit in at her high school. She often arrives late and keeps to herself, which draws the criticism of her class representative, Sekiya. After a heated confrontation with Sekiya, a primal urge awakens deep within Yui—the instinct to bite. This is no ordinary bloodlust; it leads to a pleasure said to be a hundred times more intense than any human physical experience, tied directly to her vampiric nature. Torn between her human heart and her inherited desires, Yui must navigate the everyday pressures of school life while confronting the dangerous impulses that threaten to consume her. The story follows her as she wrestles with her dual identity, and her complicated relationship with Sekiya becomes the catalyst for a journey filled with supernatural tension, awkward comedy, and romantic complications.