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The manga version of the live action Robot Keiji tv series. The story is about a robot named Robot Detective K dressed in a human Detective outfit fighting kaijin.

Cheerful young Kashima "Tora" Toranosuke wanted to become a hero and ended up as a police detective. When he joins the police force, he gains not only his dream job, but also a group of new friend. In particular, he and his gruff new partner Mahori get along so well that their coworkers begin to remark on how lovey-dovey they are. That's not true, of course. At least not yet...

It's been roughly one year since Chuuya Nakahara joined the Port Mafia, and he's got his sights set on an executive position. But as he makes plans to move up, a man by the name of Paul Verlaine—claiming to be his younger brother—appears and vows to assassinate everyone he cares about! Now, Chuuya must team up with Adam, a European A.I. investigator, to stop this lunatic before the storm swallows Yokohama once again... (Source: Yen Press)

Gokuu is an ordinary private eye for hire. While working on a case involving an illegal weapons dealer, he notices a lot of the detectives working on the case committing suicide for no apparent reason. After Gokuu gets a little too close to the truth, he is then put in a situation where he must stab out his left eye to avoid certain death. Gokuu then awakens in a mysterious lab where an unknown scientist replaces his eye with a cybernetic one that allows him to control every computer in the world.

"This isn't an oath, it's a contract." An omega opening a detective bureau, Jitsuya Idou, has a pair. Kazuhiro Kitakouji, Jitsuya's alpha, is an elite detective from the Metropolitan Police Department. Together they're business partners who made a mutual agreement to become a pair. Jitsuya uses this pair to control his omega constitution. As an "S," Kitakouji uses Jitsuya for insider information. Even though it was meant to be a cut and dry relationship, an omega's body needs to have sex regularly with his pair. Involuntarily, Kitakouji and his omega's body are forced against their will. The most vexing for both of them, the sex with their pair is the best they've ever had. While continuing this distorted relationship, an illegal drug case aiming at omegas is at large!? (Source: Media Soft, translated)

The end of the 19th century—a vampire's wife is murdered, and the detective known as the "cage user" is called in to solve the crime. But there's more to the detective and the curtained birdcage he carries...after all, when solving a case involving a monster, it might just take one to know one! (Source: Kodansha Comics USA)

Responsible, no-nonsense police officer Munakata is known for his exceptional skills and high arrest rate. His perfection is the the envy of all. But, Munakata has a secret he can't tell anyone: his body's filthy longing to be humiliated. Unable to repress his flagrant desires, he indulges in risky behavior whenever he's alone at night. When starry-eyed rookie officer Toru discovers his hero Munakata's secret, he opens the floodgates to forbidden pleasures... (Source: Renta!)

In December of UC0073 Investigator Leopold Fieseler of the Zeon National Public Safety Division is investigating a series of terrorist bombings that have been occuring on Side 3 when without warning he is contacted by an old childhood friend, Elise Ann Finnegan, who is now working with the Prefectural Office. When they meet, she hands him a disk containing a list of Zeon Officials marked for assassination; Officials who have been dying during the very bombings he is now investigating. At first he thinks that its data that has been leaked to the press, but as he scrolls down he discovers something further. This list does not stop with those who are already dead, and at the bottom of the list is the name "Commander Gihren Zabi" - the Leader of the Principality of Zeon. (Source: Ephidel)

Alphonse is a humanoid dragon who, after encountering trouble in his former position, has been transferred to the Special Prevention Office Against Vermin. On his first day, he not only gets lost and is late, but he also stumbles across a robbery. During the resulting chase, he gets some unusual help from his new partner, who is also his boss? A tale of inter-species partnership! (Source: Hero Scans)

Young rookie detective gets assigned to a surly yakuza investigator who wants nothing to do with him. Chikara's persistence to help Ibuki in his investigations leads him to follow Ibuki late one night. Chikara sees Ibuki and 3 others carrying a large wrapped bundle out of a church, which he thinks might be a body. Dazed as he makes his way home Chikara almost gets hit by a car. Next thing he knows Chikara finds himself in a hotel room with the dazzlingly gorgeous driver about to experience his first taste of male on male pleasures.

Story of a buxom and no-nonsense crime-fighting mentalist. (Source: MU)

Centered around two rookie inspectors of the Ministry of Welfare's Public Safety Bureau (MWPSB); Arata Shindou and Kei Mikhail Ignatov. These two inspectors are confronted with an ever changing society under the jurisdiction of the all knowing and impartial system of collective consciousness known as Sibyl and a contradiction that exists solely to evince the imperfections of the Sibyl system. Contending with an increasing anti immigrant sentiment, political intrigue, as well as peculiar individuals who exist solely to test the Sibyl system, these two inspectors are confronted with two choices, which are to either follow or overturn the system. (Source: ANN)

The chief officers. ACCA's elite. Five of the most powerful men in the nation... Although their story has ended, the question remains—how did it begin? Take the chance to peek behind the veil of secrecy and intrigue to find out the origins and relationships of the final five chief officers. (Source: Yen Press)

Novel that focuses on Kagari Shuusei.

There's no lock Detective Dobin Kim can't open. With his unique "opening" ability, he can unlock anything—even people—to get the information he needs to hunt down criminals and solve crimes. Enter Locker—his polar opposite and his enemy. When Locker uses her ability to "lock" a witness and prevents Kim from accessing key information in a crucial case, they plunge into a cat-and-mouse game with justice itself at stake. When two equal forces collide, who will emerge the victor? (Source: Webtoon Entertainment)

A Steampunk mystery from the creator of Silent Mobius! In this tale of a past (or future?) that never was, in the age of Steam, masked dandies, dastardly supervillains, and sentient machines stalk a Japanese Gotham by night. Are the sharp wits and quick reflexes of wunderkind detectives Narutaki and pretty nurse Ling Ling enough to thwart evil and unravel the mysteries of this strange world? All steamed up.... When Narutaki meets Ling Ling, a pretty nurse with a dark secret, he gains both a true-blu friend and two new assistants. He'll certainly need all the help he can get when he is forced to do battle with such nefarious villains as the Phantom Knight, the Machine Baron, and Dr. Guilty! (Source: VIZ Media)

Kondou Takeshi is a new rookie police officer who now works to capture criminals of all different kind working together with Miki and all the other police officers which seem to be all women. -Baka-Updates Manga

Since his childhood, Detective Ukishima has always been aroused by life-or-death situations. This leads to a sexual encounter with a suspicious stranger, Makabe, who quickly learns how to exploit this weakness. Ukishima is set to leave him behind as a one-night stand, but to his shock, he soon runs into him again as Makabe is a suspect in his investigation. However, the man seems willing to cooperate to a degree and entirely determined to keep their affair going.

Kuroda is a homicide investigator who was locked inside a house with his dead family for days as a child. The trauma left him with the ability to pick up the scent of a dead body quicker than anyone else could. Kuroda is assigned to the "Special Search & Investigations Office," aka the "S&I Office," a new team created within the MPD to investigate unique missing persons cases, where he meets a brilliant criminal profiler named Ikaga... The man who can find dead bodies the quickest, and the man who can arrive at the perp the quickest. The living and the dead meet in this police suspense story! (Source: Coamix)

Traversing the war-scarred lands of the Southeast Asian Union outside of Japan, Shinya Kougami's next destination is the Tibet-Himalayan Alliance Kingdom. On his way, he makes acquaintance with Guillermo Garcia, commander of a paramilitary group with the goal of restoring peace, but refuses his offer to join them. When Kougami jumps in to aid a vehicle of refugees being attacked by guerrillas, his remarkable combat skills awe Tenzing Wangchuck—a young girl of Japanese and Tibetan descent who lost her parents to the violence of war. Motivated by Kougami's ability, Tenzing requests that he teaches her how to fight for the purpose of taking the life of the man who killed her parents. Although murder conflicts with Kougami's unwavering morals, he sympathizes with Tenzing and agrees to train her. But soon enough, Frederica Hanashiro from Japan's Ministry of Foreign Affairs appears, on her mission of bringing back to Japan and the Sibyl System the once abandoned Japanese emigrants—one of whom is Tenzing. [Written by MAL Rewrite]

Crimes committed by "Kaijin," superhumans produced by technology, are on the rise in Tokyo. Shibasaki Ken and Momoyama Reiji are assigned to work together to solve a recent serial killer case. In some ways they complement each other nicely: Shibasaki is an expert tracker, and Reiji is an expert at combat. Their personalities, however, do not mesh at all. Shibasaki would rather skip work to flirt with girls, while Reiji is violently overzealous about his job. Will they be able to work together to solve the crime before more lives are claimed? (Source: MU)