Ryo Saeba works the streets of Tokyo as the City Hunter. He's a "sweeper" and with his sidekick Kaori Makimura, he keeps the city clean. People hire the City Hunter to solve their dangerous problems, which he does with a Colt Python. When Ryo's not working on a case, he's working on getting the ladies, and Kaori must keep him in check with her trusty 10 kg hammer.
After helping to protect a young girl named Akemi from some ruthless thugs, she insists that Ryo is her future husband and that they were destined to be married. While Ryo is able to get away, Akemi decides to enlist his help as her bodyguard to protect her from an unknown assailant named Kaijin X. In fact, the marriage story is a farce so that Akemi can leave her career as a young model.
Ryo discovers that Akemi is being targeted by a professional assassin named the Silver Fox. Ryo must protect her while helping her get out of a career in entertainment.
To restore the honor of an Iga Ninja Clan, a female ninja decides to challenge Ryo, entering the duel with less then stellar skills. However, she is flanked by three ninja cohorts who plan to present a challenge to Ryo.
Ryo runs into a young beautiful nun who has lost her cross after a night in the town.
When there is a spate of random shootings in Shinjuku, a sister of one of the victims wants Ryo to catch the killer and bring him to justice. But Ryo can tell that there is much more than justice that his client is interested in.
Yoko is furious about the drug bust and realizes that the City Hunter was involved. While on a search at the scene, she is accosted by members of the Unryu-Kai gang who have a grudge against Ryo and realizes this is the best opportunity to have an interview with the City Hunter.
Ryo must protect a lovely casino dealer as she prepares for a showdown with a rival syndicate in order to win her freedom. Meanwhile, Ryo is pitted against a powerful gambler who exploits Ryo's weaknesses to their fullest extent.
Ryo's partner Hideyuki is frantic over the disappearance of her sister Kaori as a spate of abductions of women have swept Shinjuku. As he is trying to find his partner's sister, he comes across a man who is not who he seems to be. Together, they must find the secret into the kidnappings.
As Kaori takes over as Ryo's new partner, Ryo is called upon to solve a string of incidents involving actress Yumiko Sato. As he delves deep into the mystery, he comes across a powerful adversary, as well as a client who may have a deadly death wish.
A boxer is killed over a fight for a championship title, and Ryo must deal with the victim's rival obsessed with glory. At the same time, he must deal with the boxer's girlfriend, whose pain is not only in her heart, but also in her body as well.
Ryo's client is a daughter of a known scientist who developed a deadly microbe that could render humanity sterile. His client wants him to protect her at all costs while she develops a vaccine, but should she be captured, she wants him to kill her before terrorists can extract the knowledge of the microbe from her.
Hideyuki is killed on Kaori's birthday as he refuses to do a request for the head of a powerful crime syndicate. Ryo must avenge his death.
An old friend of Kaori's is being stalked by strange characters who are after strange looking watches that were slipped into her bag. Despite Kaori's efforts to keep her away from Ryo, Kaori is kidnapped by the men and Ryo and her friend must rescue her.
Kaori accepts a job to protect an old man and his vintage bottle of wine from an unscrupulous wine collector. Ryo however, refuses to take the old man as his client. So when Kaori decides to take on the job by herself, Ryo decides to lend a silent helping hand.
Ryo meets Yoko Fuyuno, a reporter intent in writing a story about the exploits of the City Hunter. Ryo realizes that if Yoko writes her story, his cover would be blown, so he tries many ways to convince her to not write the story, starting from the fact that he is Ryoji, Ryo's fictional younger brother. A request from Saeko to bust a drug transportation route complicates matters so Ryo goes through extreme measures to bust the route while not attracting suspicion from Yoko.
Ryo decides to take on Saeko's request to assist a not-so-beautiful female police officer in training for an Olympic event. Ryo realizes the young officer is being targeted by a man with a grudge, while deciding to take the officer to get a makeover to unlock her "true beauty".
Ryo's client is a man who wants to fake his own death to be free from a powerful politician so he could be reunited with his daughter. The man admits to be spineless but he is more than meets the eye. Ryo must masquerade as the hitman not only to save his client, but to ensure that the men working for the politician do not bother his client again.
While doing research for a hardcore mystery novel, the publishing company sends a bodyguard to guard Azusa while she completes her book. Her adventures include visiting friendly Yakuza, an interview with Umibozu, and a plot to kill the friendly Yakuza boss. What she does not realize is that the City Hunter is the bodyguard hired to protect her.
Nelson, an Interpol Agent approaches Kaori over allegations that Kaori's deceased brother had smuggled drugs and hidden information regarding a drug smuggling route. The accusations against Hideyuki pile up when Saeko is also assigned to the case. The Red Pegasus returns with a plot to gain vengeance against Ryo and Kaori, but Umibozu is able to save the two from being abducted by the re-energized drug cartel.
Ryo is recruited by a famous fashion designer's assistant after her designs were stolen by her boss.
Ryo is requested to assist a female thief in stealing a black tulip from a fraudulent psychic. Kaori finds out that the psychic's butler has a crush on her and decides he may be helpful in obtaining the plant.
When a father requests the services of City Hunter to protect his daughter from someone stalking her at work, he finds out that the stalker IS City Hunter. The father then requests that City Hunter convince her daughter to quit her job as he feels that she may be in danger of other stalkers. Ryo realizes that the young woman has lived a sheltered life and decides to teach her a few lessons in love.
A Police detective named Saeko Nogami hires Ryo to obtain a crown containing a microchip which has stolen top secret plans inside. While Ryo agrees to do his job, he awaits his ""payment"" which leaves Kaori confused as to how this payment would be applied.
Ryo is tricked into doing bodyguard work for the daughter of a Yakuza Boss being stalked by a biker team. Ryo realizes that the daughter is the leader of a female gang at her school, and finds there is much more than what the Yakuza boss is requesting.
Corrupt businessman, an incompetent assassin, and a old lady complicates Ryo's job to protect a beautiful psychic.
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