Nakayama Akira is a normal university student.He coincidently met his Former classmate, Tamayo Reina while on his way to the university. Few minutes later the bus driver seems to lost control and the bus crashed. Akira, the only conscious guy in the bus got him and her out of the bus and tried to call the emergency hotline, but to no avail. There he saw a humanoid figure approaching him slowly and slowly.