The drama features Koizumi as Kobayakawa Fumihiko, a naive superintendent who is oblivious to his surroundings and Matsushita as Terada Torami, a foul-mouthed veteran police detective. The two of them work with other detectives seen as worthless by the organisation (thus earning the name Zerogakari because anything multipled by zero is still zero) to solve various difficult cases. Regulars from the first season who will be returning in the sequel include Adachi who plays Honjo Yasuko, an admin officer who insists on working only between 9am and 5pm, emphasizes productivity and has a venomous tongue, TKO's Kinoshita who plays Sakuraba Yusaku, a hardworking detective who cannot climb up the hierarchy despite his efforts and Oosugi who plays the section chief Kameyama Yoshio tasked to spy on Kobayakawa secretly.
Koizumi commented that the teamwork they have in this drama is different from what he has experienced so far as everyone is in sync with one another and they can add ad-libs as and when they like as long as the director feels that it doesn't affect the story. However, upon learning that the scriptwriter Yoshimoto Masahiro was also at the event, Koizumi apologised for changing the lines during the filming and quickly tried to make amends by saying that he likes Yoshimoto's script. This made his co-stars tease him for switching his stand so quickly.
As part of the event, the actors also participated in a 20-min crime prevention campaign parade at Suginami where they walked for about 600m from the ward office to JR Asagaya Station in the sweltering 35 degrees Celsius heat. Koizumi greeted the people who alighted at the station and asked if they knew who he is and that he wasn't doing a street rally like what politicians do.
Oosugi revealed during the event that he has started his own Instagram account recently at the recommendation of Kinoshita and Adachi but it is only accessible to his 7 followers who are his family members, staff members, Kinoshita and Adachi. Although he has only uploaded 6 photos to date, he doesn't rule out the likelihood of opening the account for public viewing during the broadcast of this drama.
Sources: Nikkansports / Sanspo / Yomiuri Hochi / Oricon