A tragic murder case occurs. Seeing the mother of the victim clinging to the victim's body and weeping, female investigator Ozawa Masumi vows to arrest the culprit. Several years pass without any clues to the perpetrator, but one day the victim's mother contacts her, saying that she has regained the memories she had lost from the shock of the crime! The mother claims that the man she thought was the culprit, whom she passed right after the crime, is Oshima, the president of a management consulting company. Masumi heads to Oshima's office alone to find out the truth, but...