Kenjiro Kuranuki

Ichiro Numata (Hiroaki Murakami) is the chief editor of a publishing company. He suddenly falls unconscious and is hospitalized, but various cases takes place at the hospital. Hospital Director Kenichiro Asashima and Chief Nurse Junko Amemiya goes missing. There are rumors that they were in a close relationship. Head of Drug Management, Yasuharu Horimura is found dead. Rumors were that he stalked Junko Amemiya. The investigation into his dead is carried out as a suicide case, but Detective Eiji Kirishima (Takanori Jinnai) suspects foul play. Ichiro Numata follows with his sharp eyes what transpires at the hospital and he also holds a secret.

Kintaro Yajima comes to Tokyo and is hired by Yamato Construction Company when he saves the life of the company's CEO. A former leader of a motorcycle gang, Kintaro is known for his highly principled and forthright way of dealing with matters and is never afraid to tell his superiors exactly what he thinks. This has a tendency of irritating some; but when corruption from within the company begins to surface, he may be the only one who can stand up to it.

Kumiko Yoshikawa joins the Big Wing company at Tokyo International Airport. It's her first day and she is full of enthusiasm, but that leads her into trouble.

Akiho Takeda is assigned to #3 investigation team for The Tokyo Metropolitan Police Department. On her first day at work, a burglary takes place at a jewelry store in Shibuya. The case though is taken by the #1 investigation team which Akiho hoped to join. Nevertheless, Akiho goes secretly to the jewelry store where the theft took place. Later, a safe at a jewelry store in Roppongi is broken into. Stolen from the safe is the diamond called "Besu". The "Besu" is one of three diamonds that makes up the "Kuraida Family's Three Sisters". The other two diamonds are "Ani" and "Kyasari". The diamond "Ani" was stolen from the jewelry store in Shibuya, that occurred a few days earlier. Several people believe the two diamond thefts were done by the same person(s), but Akiho mentions the techniques used by thieves are different. Yet, Akiho believes there must be a connection between the two cases.