The series chronicles the adventures of a woman Rei, who, working for a fictional Tokyo Metropolitan Police Department secret agency called Zero Division, goes undercover to infiltrate and assassinate drug kingpins, mercenaries, and various criminals and their henchmen.
Agent Zero is a cop that uses her own methods for dealing with criminals. After she unlawfully kills a rapist in a violent fashion, she is sent to prison and stripped of her badge. But very soon after, a rich politician's daughter is kidnapped by a ruthless gang. Agent Zero is let out of prison with the mission of going undercover to find the politician's daughter and return her safely. Using her deadly red handcuffs, she disposes of the criminals one by one.
A famous businessman's links with organized crime are looked into by the Zero Division of the Tokyo Police, with the investigation being headed by a highly trained, extremely violent and very beautiful female officer. When not having shoot-outs with the crime syndicate thugs trying to kill her, she spends most of her time in her apartment, wearing lingerie and taking showers. A sub-plot involves the businessman's S&M-obsessed daughter.
A gang of young thieves try to rob a mob boss, but their heist is interrupted by an officer of the Tokyo Police Department's elite Zero Division. They get away with the loot, but the officer, a beautiful, more-than-slightly psychotic young woman who also happens to be an excellent shot, is tracking them down. To bring the case to a successful conclusion, she must deal with rival crime gangs, small- time crooks, and the wavering loyalties of her own partner.
A special agent of the Tokyo Police has been given the assignment of assassinating a group of crime bosses. Soon afterwards, she encounters the hitman the crime bosses have sent to kill her. After talking together, they discover that they are equally reluctant to carry out their assignments. They are pushed onward by their respective bosses, however, until they must both decide where their loyalties truly lie.
Rei, the deadly but reluctant assassin for the Zero Division of the Tokyo Police Department, befriends a young man after she sees him cruising a gay bar looking for johns. After he gets beaten up by a group of street thugs, she takes him in to live with her. When a series of vicious murders takes place, she begins to suspect that the killer may actually be her friend taking revenge on everyone who has abused him. Will she uphold her duty to the police, or protect her only friend?
A woman with no past or identity, Rei is a gorgeous undercover agent for the Zero Department, a deadly shadow division of the police force. But her skillshave made her a threat and this sleek, sexy assassin has been marked for death by a rival organization. It will take this deadly seductress every ounce of her cunning to survive!
In this installment of the Zero Woman series, Rei, the number-one assassin of the Tokyo Police Department's secret Zero Division, has been assigned to take out a notorious gangster responsible for dozens of murders. At the same time, she must protect the gangster's mistress from the hitmen who want to keep her from telling the police what she knows. At first, both women are upset about the arrangement, but they eventually come to appreciate each other.
Rei, whose undercover role is so guarded that there is no written record of her identity, is well known for her accuracy in completing missions and her willingness to get naked if the situation calls for it. When she's instructed to bust Kayama, who has been buying confiscated drugs from corrupt police officers, she finds herself in a sticky situation -- not only is she attracted to him, but Kayama, like Rei, does not officially exist.
The Metropolitan Police Department '0'section, known as an organization in the police department that investigates a closed case. Well-trained detective in the '0' section, Rei, is looking for her memory that was lost during the training, while also investigating a human traffic which young woman being a victim. One day, classified killer virus was seized by rising terrorists. To investigate this case, public safety sent Sarah Kodama who specializes in molecular biology and computer, to work with Rei but Rei refuses to work with Sarah. Sarah was curious about mysterious Rei, so she starts to collect Rei's information and goes to see Rei's former boss, Asami. However, the man who appeared in front of Sarah was an assassinator who contemplates destruction of '0' section. What happens to Sarah...!? What is in Rei's lost memories!?
A mysterious female spy is recruited to infiltrate the Japanese underworld and gather evidence for a clandestine secretive branch of the Tokyo Police Department.
