A decade ago, an explosion rocked Hisano's apartment building. She would have been inside, but she had been struck by a bicycle ridden by a boy wearing blood-stained clothes. He dropped a toy scale during the incident, and she has kept it as a good-luck charm ever since. Now a high school student, Hisano finds herself in the midst of a police investigation after one of her teachers is murdered. A young man suddenly appears, carrying the toy scale that belonged to the boy. And perhaps... can he also see the hallucinations that have always plagued Hisano? Everything is connected as the pattern slowly rises to the surface.