Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.

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.

Izumi Sakuragi is a new police sergeant with the Special Investigations Office, which was set up within the Metropolitan Police in November last year. The new investigation team uses DNA analysis and the latest in forensics science to investigate cold cases as well as cases suspected to involve missing persons.

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.

Former delinquent turned unconventional prosecutor Kohei Kuryu shakes up the legal world with his street-smart instincts and unorthodox style, clashing with ambitious colleague Maiko Amamiya while his relentless pursuit of justice gradually transforms those around him.

Yū Amagi is a slightly eccentric detective who has been assigned to the Twelfth Section of the Tokyo Metropolitan Police Department's First Investigative Division from the Lost and Found Centre. The Twelfth Section is called the "graveyard of detectives" and ridiculed as the "banishment room where hardened detectives who cannot be fired are sent." Its assembled detectives Kōsuke Samura, Takumi Yamashita, Keita Nagasawa, Tamaki Mizuta, and Masatoshi Katagiri are elite and yet oddballs. Amagi appears fixated with time which seems to have no relation with a case. Raising questions about the timelines of the perpetrator and victim derived from the estimated time of death, time of crime, time of alibi, and time limit, he searches for the meaning of "blank time" which arises from this. He obsesses over the weight of every minute and second of time because of some incident.

The life of an American woman living in Kyoto, Japan, is upended when her husband and son disappear in a mysterious plane crash. As consolation, she's given Sunny, one of a new class of domestic robots made by her husband's electronics company.

Mikoto, a forensic investigative examiner, and her partners trace down the evidence of crimes and unravel the puzzles behind mysterious deaths.

Two transfer students, Takashi Mitsuhashi and Shinji Itō, tired of their boring normal life and unpopularity, decide to take their arrival at a new school as an opportunity to reinvent their image, and become delinquents. The duo set out on various misadventures to become the greatest delinquents in all Japan!

20-year-old rookie police officer Kawai Mai works hard at a police box and feels both physically and mentally drained. She has never felt appreciated even though she supposedly works for the sake of the area’s residents. In addition, she does not find working at a police box rewarding. Mai is about to hand in her resignation when she meets 30-year-old Fuji Seiko, the former ace detective of the Criminal Investigations Division. Seiko is said to have been forced to transfer to the police box for harassing a subordinate at work but … … This encounter between Mai and Seiko will significantly change their lives as they are suddenly paired up. This odd pair struggle to help and support each other in cases, routine duties and romance?! And Seiko’s true reason for coming to the police box is revealed.

Light Yagami finds the "Death Note," a notebook with the power to kill, and decides to create a Utopia by killing the world's criminals, and soon the world's greatest detective, "L," is hired to find the mysterious murderer. An all out battle between the two greatest minds on earth begins and the winner will control the world.

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.

Led by their fervent teacher, a high school baseball team full of delinquents vows to make it all the way to the national championship tournament.

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Mano Reiji, a man who experienced a gruesome incident, is a forensic researcher at the Tokyo Metropolitan Police Department's Investigative Science Research Institute. Under the belief that "appraisal will result in the truth" and with his vast knowledge, Mano approaches cases from a view point that differs from others. On the other hand, Sawaguchi Nonna (Araki Yuko) is a rookie forensic researcher that begins working with the no nonsense Mano. They are forced to work together on a murder case.

University student Sogawa Ichika inherits 5 trillion yen from her father all of a sudden and attempts are made on her life by his siblings. The avaricious family has struck a deal to let the person who kills Ichika first have all the money to himself or herself and tries all means to take her life. Ichika’s housekeeper hires the investigator Chikumagawa Hikaru, who has a perfect record of solving cases before they happen, to protect her.

When fish shop owner Shamoto's teenage daughter Mitsuko is caught stealing, a generous middle-aged man named Murata helps resolve the situation. The man and his wife offer to have Mitsuko work at their opposing fish store. Shamoto soon discovers that something far more sinister lives behind Murata's friendly demeanor.

Genji and his victorious G.P.S. alliance find themselves facing down a new challenge by the students of Hosen Academy, feared by everyone as 'The Army of Killers.' The two schools, in fact, have a history of bad blood between them. And the simmering embers of hatred are about to flare up again, burning away any last remnants of the truce they had so rigorously observed until now.

Bent on revenge, a traumatized ex-police officer must infiltrate a yakuza organization by befriending one of the group's most unhinged members.

Members of SWORD win against Wangan Rengogun, which is led by Kohaku. The city becomes peaceful again. Nevertheless, the most brutal gangs, Doubt and Prison Gang, appear. They try to dominate the area controlled by SWORD.