A tragic violent murder incident occurred. Masumi Ozawa, a female investigator, vows to arrest the culprit as she sees her mother clinging to the corpse of the victim and weeping. One day, after several years had passed without any clues as to who was responsible for her crime, she received a call from the victim's mother who was so shocked that she regained her lost memories! Her mother claims that the man she believes to be the culprit she passed by right after the crime was Oshima, the president of a management consulting company. Masumi heads to Oshima's office alone to find out the truth about her, but...