An isolated high school student and trained Quarantine hero, who suffers from a dissoactive identity disorder, who lives in a world where an inhuman blood disease threatened humanity, turning people into zombie-like superbeings known as The Unlined and is ruled by the corrupt anti-terrorist organization, Endometrium, led by the power-hungry catgirl Kuroneko Yagashi. But the virus also gave some people abilities that are powered by their blood, so the less blood they have, the weaker they become.