Toshiaki Shiraishi (Seiji Fukushi), a surgeon at the University Hospital, was killed by someone in the hospital. The first discoverer was surgeon Haruka Akikawa (Miko). It was a woman who inspector Zenigata (Ryohei Suzuki) used to do favors! Haruka explains the situation to the Zenigata. It is said that it was not becoming a mind that Shiraishi leaked, "It made a mistake" on the day of the incident, and it searched for Shiraishi as soon as the hand was vacant. Soon, the theory of the relationship between Haruka and Shiraishi emerged. However, Zenigata insists that the key to the incident lies in Shiraishi's word "mistake." Before long, I will find the key to Shiraishi's movements over the past month!? It was also found that Shiraishi had been arguing with a suspicious man on the night of the incident. Zenigata and Natsuki (Atsuko Maeda) meet a man, but Haruka and The Director of Surgery Katsuichi Yoshike (Kenichi Yajima) disappear at the tip of the arrow!