Female. 20 years old. Assigned to the Machiyama Police Station, Community Safety Division, Machiyama Police Box. She was posted to the Machiyama Police Box as a rookie. She is very pure and incredibly airheaded, though she doesn't realize it herself. She has a habit of bluntly stating her opinion even to superiors without reading the room. Paired with Seiko Fuji.

Female. 30 years old. Machiyama Police Station, Community Safety Division, Machiyama Police Box. Formerly an ace detective in the Criminal Investigation Division, she was transferred to the Community Safety Division. She is paired with the rookie Kawai and oversees her training. Extremely capable as a police officer, she graduated at the top of her class at the police academy. She speaks her mind clearly.

Male. 46 years old. Machiyama Police Station, Community Safety Division, Machiyama Police Box. The head of the Machiyama Police Box. Boss to Fuji and Kawai. His subordinates call him "Chief." In reality, he is the one who thinks about and watches over the two of them more than anyone else.

Male. 30 years old. A detective in the 1st Investigation Section, Criminal Investigation Division of Machiyama Police Station. Paired with Yamada. He was Fuji's classmate at the police academy. Known as a "genius of interrogation," his ability to make suspects "crack" is the best in the station. He calls Fuji "Seiko-chan," but they are constantly bickering.

Male. 29 years old. A detective in the 1st Investigation Section, Criminal Investigation Division of Machiyama Police Station. Paired with Minamoto. He was one year behind Fuji and Minamoto at the police academy. He has been worked to the bone by the two of them since his academy days and is still used for their convenience today.

Female. 27 years old. The sole woman in the 1st Investigation Section, Criminal Investigation Division of Machiyama Police Station. Having been raised in all-girls schools, she struggles to adapt to the "total boys' club" environment of the Criminal Investigation Division. While her motor skills are disastrous, she is highly intelligent and excels at paperwork. Paired with Suzuki.

Male. 25 years old. A detective in the 1st Investigation Section, Criminal Investigation Division of Machiyama Police Station. Entered the police academy after graduating from an all-boys high school. The literal definition of serious, he excels at information gathering. Paired with Makitaka.

Male. 48 years old. Section Chief of the 1st Investigation Section, Criminal Investigation Division of Machiyama Police Station. He has a fierce face and a harsh way of speaking that makes him seem terrifying at first glance, but he is actually kind and cares deeply for his subordinates. His constant shouting is actually a way to protect his team from the higher-ups.