Gu Zi, a human girl with excellent morals and academics, has been living an ordinary life. Until one afternoon a nearly perfect transfer student came to the class, and everything gradually changed. However, two girls died of illness in the school. Is it a coincidence or...? Gu Zi, who was at the same table as him, gradually became familiar with the boy, and even discovered his special identity... From then on, the two began to have an emotional entanglement about blood...