The culprit is Itaru Kaburagi. The victim, whose real name was Ari Sukiyama, was a marriage swindler who tricked Itaru's good-natured older brother into supporting her, leaving him with a huge debt that drove him to suicide.
The culprit is Reisuke Inaba. He killed Ninka because she threaten to reveal their affair to the media unless he divorced his wife and the victim blackmailed him even though the victim was the one who introduce the married Ninka to him and the victim told Reisuke that he could write scripts better if Reisuke cheated once for.
