Kenji Takenouchi

Karin, a sex detective, and Nana, an assistant, have protected the peace of Shimbashi based in a Chinese-style oil beauty salon. In the city, a mysterious incident occurs in which women disappear one after another, but Karin is not so absorbed in having sex with the New York Police Department Kasumi. Nana aims to solve the case with a newcomer China Girl Hachi and pseudo-sex detectives who are a reserve army of sex detectives. As the investigation continues, the shadow of a male office worker who is envious of his female boss, as well as the super-male and female criminal association ADAM, begins to flicker.

Horigai spends her boring days waiting to graduate from college. As she hangs out with friends, she begins to realize the violence and sorrow behind their ordinary lives.

Shogo Higuchi is a detective whose wife was murdered by a serial killer. Hikari Tachibana is a voice profiler whose father was murdered. She has a special hearing ability which allows her to hear minutiae sounds that other people do not.

Hama Shoko is a 32-year-old single woman and a contract worker. She is not good at romance and does not have a boyfriend, but she wants to get married. For the past 2 years, she has been looking for a man to marry. Still unable to find the right guy, Shoko decides to take a solo trip. While on the airplane, she meets a handsome younger man. During her trip, she happens to meet the younger man again. Shoko lies to him and tells him that she is a married woman. The man tells her "let's have an affair during this trip."