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 beacse she threaten to revel their affairto the media unless he divorced his wife and the vcitme balckmailed him ever though the victims was the one who introduce the married Ninka to him and the victim suggested to Reisuke to cheat once for the play.
