A decade ago, the apartment building where Hisano resided suffered an explosion. Fortunately, she was not present as she had been struck by a bike-riding boy wearing blood-stained attire. During the incident, the boy had dropped a toy scale, which has since become a good-luck charm for Hisano. Presently, Hisano is attending high school and is dealing with the aftermath of her teacher's murder, which is being investigated by the police. At this time, a young man arrives, holding the very toy scale that belonged to Hisano. Is it possible that this stranger can also perceive the same hallucinations that have tormented her for so long? As the pieces of the puzzle slowly come together, it becomes increasingly apparent that everything is connected.
