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.

Satoshi Itomura is an assistant police investigator who belongs to the Metropolitan Police Department’s Scientific Investigation Team. Reenactments, fingerprint and voice data collections, profiling... His team collects scientific evidence and pieces together fragments of information in order to help build evidences. However, Itomura often does not care about the scientific approach and instead pays a great deal of attention to the things that the victims always carried with them or treasured. And he focuses on these things because they usually carry the victim’s dying wishes, understanding that last message not only helps solve the cases but also brings closure to the depressed family of victims.

A Japanese girl from a poor family named Hanako went on an adventure to study in a girl's Christian school in Tokyo. She found her passion in English and step by step made her dream come true.

Yukiko Makabe works at the #3 Special Investigation Team of the Metropolitan Police Department. She has excellent negotiation skills. Yukiko then attempts to negotiate with a hijacker on a bus, but something unexpected happens and her mission fails. Yukiko takes full responsibility and takes a transfer to a special interrogation team "Kintori". Her boss is Katsutoshi Kajiyama and Yukiko has had a difficult working relationship with him in the past. Her other coworkers include Susumu Hishimoto, Zenjiro Nakata and Haruo Koishikawa.

Narrates the events and cases encountered by Kaoru Utsumi, a rookie detective, and Manabu Yukawa, a university associate professor, while the two pair up to solve many mysterious cases.

A random mass stabbing, major food company Titus Foods, and a mysterious infant disease. These three things have as much in common as Detective Soma, hack writer Yarimizu, and the stabbing's lone survivor, Shuji. Yet, these men are now embroiled in a risky quest for the truth. What they find, though, is more heinous than they imagined, making them question just who is the real criminal?

Shūichirō Kiriyama works at the Limitation Task Force, the place where the cases which have reached the statute of limitations are destroyed. Getting bored of his job, he decides to find a hobby, because it seems important to him to have a hobby. So he decides to puzzle out the unsolved cases on his free time, helped by his coworker Mikazuki, who seems to have a crush on him.

Inami and Tamaru work at the Public Security Mobile Investigation Unit Special Investigation Team, a team made up of specialists with different expertise. Inami tackles criminals with showy maneuvers, while Tamaru corners criminals with cool calculation. Together, the team tackles terrorists, new religious cults, military spies, secret narcotics organisations and complicit politicians.

Enomoto Kei is a security "otaku" working for a security firm, devoted to improving the securities system on a daily basis. He is not an easy person to familiarize oneself with, always collected and calm, unapproachable, a maniac in Physics, Science, Architecture and profound in other basic theoretical foundation. He is certain and proud of the fact that there is no key which he cannot unlock. One day, Kei is asked to help reveal a mystery behind a locked room murderer. While he lacks any interest in solving the mystery, he is inevitably intrigued by the term, "Closed Doors" and decides to take on the position. He works side by side with Aoto Junko and Serizawa Gou, who are lawyers working at a major law firm. Junko is pure and forward, acting upon her instincts while Serizawa is a prideful elitist who sees time as money, and therefore, will not take on any job that is unprofitable. Possessing a vast amount of knowledge and acute insightfulness, Kei is able to unlock the closed doors and unravel the secrets leading to the solution. Never before has there been a drama focused solely on closed doors.

Hanasaki Mai is but an ordinary employee of a bank, with zero diplomacy. She doesn't think twice about pointing out her boss' mistakes. Her job is to investigate any wrongdoings in the bank branches. She is the voice of the suppressed staff who are unable to go against their bosses. Her partner is the veteran staff, Soma Ken, whose career with the bank had reached a dead end, no promotions in sight. Together, they resolve all the non-compliance issues at the bank.

University student Kuno Totono is the type who constantly questions what is taken for granted in society and develops his own theories based on his vast knowledge and unique set of values. One day in autumn, the police come to see him. His university schoolmate has been murdered at a park nearby and the police apparently regard Totono with suspicion. He is asked to come with them for questioning. In the interrogation room, the police are manipulated by Totono who tends to digress from the topic and poke at their contradictions. He even correctly guesses that one of them is troubled about not getting along with the wife and ends up giving advice. However, Totono’s fingerprints are eventually discovered on the murder weapon.

Saburo is a high school student good in sports, but not very good with his studies. One day, Saburo travels back in time and arrives in the Sengoku period of 1549. There, Saburo meets Nobunaga Oda who looks and sounds just like Saburo. Nobunaga Oda is the son of a warlord and magistrate of the lower Owari Province. Nobunaga Oda though is physically weak and he asks Saburo to take his place. Then, Saburo as Nobunaga Oda attempts to unify the country of Japan.

The story of a teenage boy called Yu, who falls for Yoko, a girl he runs into while operating for the sake of sin as an upskirt photographer in an offshoot of the porn industry. His attempts to woo her are complicated by a spot of cross-dressing - which convinces Yoko that she is lesbian - dalliances with kung-fu and crime, and a constant struggle with the guilt that's a legacy of his Catholic upbringing.

With the first place in a university business competition and a father running a time-honored leather bag store, Yusuke Tsuruta is in the "outstanding" category among university students. After graduation, Yusuke decides to start a business with his classmate Kengo Sato. After declaring that "Company is not school!", he works hard every day to make his business successful.

High schooler Ichitaka Seto is in love with classmate Iori Yoshizuki, but is too shy to tell her. Again and again, he plans to tell her his true feelings, but each time something – usually a misunderstanding of some kind – gets in the way. Things complicate further when Itsuki Akiba – whom Ichitaka was friends with in their childhood before she moved to the United States – returns, her crush on him still intact.

Workers at the Fukushima Daiichi facility in Japan risk their lives and stay at the nuclear power plant to prevent total destruction after the region is devastated by an earthquake and tsunami in 2011.

Two people, sake and gourmet. Yoshioka (Asaka), who is stressed by work, reunites with Keiko (Nakamura), a longed-for senior, because of his work in the “U-shaped bar” with a U-shaped counter.

Hitsujitani Chiharu joined a big advertising agency after she graduated from a university. She experienced a hard time at her job due to harassment. After 3 years, Hitsujitani Chiharu decided to quit working at the advertising agency. She begins to work for a temp agency that is run by her aunt. There, she meets Kurusu Arashi, who works as a career adviser at the temp agency. He walks with a cane due to discomfort from his left foot, but he has a great reputation as a career adviser and his nickname is The Devil of Changing Jobs. He often makes biting remarks to people worried about changing jobs. Working with Kurusu Arashi and dealing with people who are looking to change jobs, Hitsujitani Chiharu also grows as a person.

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Mike Hama, Private Detective, is a chain-smoking, wisecracking tough guy with a weakness for the ladies and a soft spot in his heart, especially for his kid sister Akane. Mike's so down on his luck he'll take any case, from finding a lost pet to spying on cheating spouses. But every now and then, along comes a client with dubious and dangerous case… and that's when Mike shows his stuff.