Koji Tazawa

Zenigata Rai is tracking down Detective Okano, who disappeared in the "Forest of Golgoda" in Akasaka, Minato Ward. However, she also gets involved in an incident and goes missing. Rai's cousin, Zenigata Rei, joins forces with Detective Matsuyama, who was once Okano's partner, to investigate the two cases.

Kintaro Yajima comes to Tokyo and is hired by Yamato Construction Company when he saves the life of the company's CEO. A former leader of a motorcycle gang, Kintaro is known for his highly principled and forthright way of dealing with matters and is never afraid to tell his superiors exactly what he thinks. This has a tendency of irritating some; but when corruption from within the company begins to surface, he may be the only one who can stand up to it.

Zenigata Mai is a high school girl who sidelines as a detective. Her father is a high ranking police officer, so her partner Jun Godai is forced to allow her to participate in investigations, often through cellphone conversations.

Yumi, a 23-year-old office worker, is fired from her job out of the blue. A few days later, coming from a friend's wedding and having no time to change out of her kimono, she is rushing to an interview for a job at a publishing company. Yumi stumbles into the room, looking for somewhere to change out of her kimono, and finds popular comic book writer Reijiro Sakurai is having an editorial meeting with some staff. He is planning to lock himself away at a hot spring for the next three months to concentrate on his next project. Sakurai comments that if Yumi were to join him he wouldn't mind being away for so long..., and so their adventure begins.

Zenigata Rei (Kaho) is a a middle school student and math prodigy that also works as a secret detective. She uses her IQ of 180 to solve the mysteries of various difficult cases one after another.

Zenigata Kai appears to be a perfectly ordinary high school student. However, she is actually a secret detective who solves difficult cases one after another.

Zenigata Mei (Azusa Okamoto) is a detective who solves difficult cases using her innate intuition, wild sense of smell, and IQ of 180. She teams up with Detective Matsuyama and punishes evil with her outstanding deductive reasoning and intellect.

Zenigata Rui is a high school girl with an IQ of 180 who solves cases using her cell phone as her weapon. Rui takes on numerous challenging cases with Detectives Jun Godai and Ippei Takamura.