เลือดต่ําต้อยคือทางรอดเดียว

Ethan is the only man working as the lowest-ranking janitor at an elite girls' school. After a strange accident seals the campus off from the outside world, he discovers everyone there except him is a vampire. As the sole human, Ethan’s blood sustains all of them. Moreover, only he can move about in daylight and uncover the secrets behind the school’s isolation.