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A tragic violent murder incident occurred. Masumi Ozawa, a female investigator, vows to arrest the culprit as she sees the victim's mother weeping over her dead body. One day, after several years had passed without any clues as to who the culprit was, the victim's mother contacted me to say that she had regained her memories that had been lost due to the shock! The mother claims that the man she passed by right after the crime and who she believes to be the culprit is Oshima, the president of a management consulting company. Masumi heads to Oshima's office alone to find out the truth, but...