High school students dreamed of a strange dream about the children's past, in which she was saved by a boy who promised to protect her. Sleep seems like a fragment of his memory, but he has no memories of the past. Things begin to become more strange when there is a guy in your class that you will not know at all. It seems that all in the class know Akydzuki Torah, besides her. Feeling something strange about Torah, Ai went to the investigation and found that there were no records about him at school. Faced with him, Tora, finally, admits that he is Esper, who penetrates the school to investigate a series of deaths from the overdose of drugs that occurred at school. It begins the history of the participation of AI in the life of Torah and the dangerous events behind the investigation ...