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.

The Sex Detectives have got a new request from Kasumi Lovecraft, a detective from New York. Hatenashi’s manager, Maebari, tells him that he has been offered a job as an actor. Hatenashi gets in a good mood with Miona, a production staff member, during a commercial shooting and asks Miona out on a date. The date goes well and the two make love at Hatenashi’s apartment. However, on the way back from investigating the case with Kasumi to track down the missing Kido, the Director-General of the Police Agency, Hatenashi witnesses Miona secretly meeting with Harigata, a client of the commercial.

December 30th, 2017. Two years before the Tokyo Olympics, due to a revision of the Constitution, a National Defense Force is created in Japan and it starts military operations. In an incineration plant, a dog goes lost, but when Tani goes looking for him, she finds nothing. In the plant, Yanais takes down the Christmas decorations and replaces them with the ones for New Year. Gou, addicted to survival games, comes to the plant during the night and starts playing video games with Ken, even if it is his day off. In the meantime, Adachi is just watching their game to kill time. However, all these men share similar problems: pregnancy, adultery, family issues and a friend who died in the war. Meanwhile, Tani, who is troubled with her immoral relationship with Adachi, begins to feel that her father, who was the plant’s manager and is supposed to be dead, seems to be around somehow.

A girl and a man in a library - they talk about a story that is like warm milk. Years later, the man sets out to find the girl, because he has a story for her.