The hero of the story is a psychotherapist who is good at analyzing, interpreting, and guiding people's psychology. An astonishing murder occurred in a university five years ago. The murderer of this murder was arrested and imprisoned for life. However, the psychological evaluator in charge of the case was recently hit and killed by a car, and the hero was heartbroken when he learned that his girlfriend was killed. and began to repeatedly study the psychological report of the murderer. He found that his girlfriend's report was normal, and the murderer had no motive for the murder. He believed that there must be something hidden in the murder case, so he decided to reverse the case for his girlfriend. The real culprit. During the investigation of clues, he was summoned by the court and said that he wanted to do psychotherapy for a patient. He found that although the patient was mildly autistic, he had a very high IQ, so he slowly guided the patient to improve his social barriers. At this time, the eldest son of a fisherman disappeared inexplicably, and was even involved in a murder case of a young girl. He was also surprised to find that the former autistic patient could communicate well with the fisherman's younger son... .