Signal

The drama tells the story of a group of seven university students who travel to a deserted island where a strange decagonal mansion stands. It was the scene of a grisly mass murder six months earlier, and events soon turn ominous.

Tōko Kisaragi is a detective in the Investigation 1 Section 11 of the Tokyo Metropolitan Police Department. Her senior, Detective Hideaki Takano, has decided to move to the Public Security Bureau. Hideaki Takano's transfer will be carried out in one week. During this time, a murder takes place. A wealthy man is found dead in his home. His throat has been cut and a blue flower placed within the wound. Also, the victim's wife, Mayumi, is missing. A newspaper then receives an email from Kurasuta 16, professing themselves as the murderer. The email also implies the location of Mayumi. Since Detective Hideaki Takano is soon to transfer to the Public Security Bureau, Tōko Kisaragi feels more pressure and responsibility to solve the crime.

In 1990, Hagizaki Tatsuo, the accounting department chief of Ukishima Electric Works, was busy negotiating on getting a loan together with Sekino, the company's general manager. However, just as they were about to get the funds, Sekino was involved in a 200 million yen fraud and he later disappeared with the loan. The company decides to cover up the incident to protect its image, but Hagizaki wants to get to the bottom of the matter with the help of his newspaper reporter friend, Muraki. Hagizaki later notices that the case becomes darker and darker as he continues to investigate. He then meets a beautiful woman, Uezaki Etsuko, whom he believes hold the key to the entire incident.

From a gruesome murder to a series of bomb blasts, it's explosive storytelling from beginning to end! This “Crystal's Beating” (Suishō no Kodō) is the sequel to the immensely popular crime suspense drama series “Cocoon of Stone” (Ishi no Mayu), and the long-awaited second instalment in the “Murder Analysis Team” (Satsujin Bunseki-han) series.

The body of a person who died an unnatural death is discovered encased in mortar like concrete in the basement of an abandoned building. Why was the person murdered this way? The next day, the investigation task force receives a phone call from the criminal who calls himself Tremi during a meeting to discuss the investigation of the case. Then, in a short time after her transfer to the First Investigative Division, Kisaragi Toko becomes the negotiator. Tremi mocks and provokes the police while offering hints regarding the murder. A second murder soon occurs just as Tremi had warned. The victim's head has been covered with concrete as they had expected. What is the criminal's motive and why is the criminal fixated with concrete? The criminal's surprising actual target soon emerges...

After a junior detective dies in the line of duty during an active investigation, Detective Masaki Sara of the Tokyo Metropolitan Police First Investigation Division is transferred to Section 1 of the Personnel Division, the internal affairs unit that investigates officers suspected of misconduct. Still traumatized by his past, Masaki is forced to carry out his duties as a lonely outcast as his colleagues shun him as a snitch. One day, a message arrives. It's a tipoff that Saiko Minaguchi, Masaki's former colleague in the First Investigation Division, is leaking confidential information. Although Masaki is reluctant to investigate someone he used to work with, he obeys his boss and starts looking into Saiko. He soon discovers a link to an unresolved murder and some buried facts about the death of his junior detective Saito. What shocking truth awaits Masaki beyond his suspicions and inner conflict?

Yuri Ishikawa and her team try to crack unresolved cold cases in Kanagawa Prefecture, Japan.

Detective Ukyo Sugishita confronts crime on the basis of his own convictions. He has a partner that works for him in the Special Task Unit. For the first 7 seasons, Ukyo’s first partner is Kaoru Kameyama. He is a good-natured, hot-tempered, straightforward and somewhat scattered detective. Beginning in Season 8, Takeru Kanbe replaces Kameyama. Contrary to his predecessor, Takeru is a lanky, cool, conceited and confident detective. From Season 11 to Season 13, Ukyo’s partner is a young detective Toru Kai. Toru is a son of Deputy Director-General of The National Police Agency. But he became a detective by his own effort. And starting with Season 14, Ukyo’s current partner is Wataru Kaburagi, an elite bureaucrat who came to the Metropolitan Police Department on temporary assignment. As the first partner without any career of a police officer, he will face challenging cases together with Ukyo.

In 1989, a rookie editor visits a mysterious mansion for a séance, only for a psychic to vanish and a string of murders to begin. As a young mystery writer joins the investigation, dark secrets hidden in a cryptic poem left by the mansion’s owner start to unravel.

In 2014, a series of murders targeting women takes place in Kawasaki City. All the victims have been killed as if they had hanged and these are dubbed the "Hanging Murders" in public. The police investigation runs into difficulties without clues on the murderer. However, Detective Iguchi from the First Investigation Division has his eye on a man whom he suspects to kill for pleasure. This man is Naoya Nogi. He lies about his identity, erases his traces in public, and lives as if he is holding his breath. Nogi is actually Masato Yaginuma, the victim in the sensational Akishima mother and son kidnapping case. He gets his neighbor, Yoshika, involved as he tries to escape the police dragnet but comes to realize some facts. What is his true motive?

Tetsuhiko Toma is a surgeon who studied in the United States. He begins work at a private hospital in a rural area in Japan. He believes that people should receive the same level of care at all hospitals. Guided by those principles, he takes on challenging surgeries and saves the lives of patients. Tetsuhiko Toma attempts an internal organ transplant for the first time in Japan, but the health care system blocks him.

Eleven high school classmates awaken, restrained to a large dining room. While fearing for their lives, they question a motive to this bizarre act.

After Isao has reached retirement, he receives a phone call from an ex- elementary school classmate Norio inviting him to a reunion. During the reunion, none of them can claim to have had a wonderful life since graduating from primary school and have their respective problems now. It leads them to rethink that their lives are far from over and that there is still hope for them even at this stage of their lives. They encounter many unexpected happenings during the journey which reminds them of the excitement they experienced as kids and find new hope in their bleak lives.