Sumiko Kawamura is your normal high school student in Japan, she is currently enrolled into a private school named Cross Academy. Sumiko does not know the biggest secret of the Night Class. Sumiko lost her memories in a car crash when she was 4, and finds this man who knows her from when the car crash happened. The man sinks his fangs into her neck, and reveals himself to be a pureblood vampire. Sumiko starts to find out her past, and the many secrets of it and Cross Academy.