(from ebookjapan):

Marie's father, Larry Benson, hides the fact that he has a wife and child and is a rising bachelor star. Unable to speak publicly about her father, Marie is transferred to a boarding school, St. Rose Cross, after her mother dies.

However, when Marie enters the classroom, she is surprised to see her classmates with uniformly unhealthy pale skin, large, glassy eyes, and gloomy expressions.

She is also informed that she is not allowed to leave the school until she graduates...