The senior managing director of a prime contractor is murdered in a subcontractor's plant for engine development. The murderer is the president of the subcontractor company, who committed suicide after the crime and was not charged. The wife of the accused, Kozue (Yami Arimori), asks Fukayama (Jun Matsumoto) and others to prove her husband's innocence. She also says she feels uncomfortable with her husband's e-mail, which was supposed to be his suicide note.