Investigation Division 1 Ninzaburo Shiratori: Male. 28 years old. Inspector. Miwako Sato: Female. 28 years old. Assistant Inspector. Easygoing and kind. She has feelings for Takagi. Wataru Takagi: Male. 26 years old. Sergeant. Gentle and upright. He has feelings for Sato. Kazunobu Chiba: Male. Sergeant. 24 years old. Public Security Bureau Yuya Kazami: Male. 30 years old. Assistant Inspector. Surprisingly a comedic character. Usually possesses excellent reasoning skills and charisma.

Fumimaro Ayanokoji: Male. 28 years old. Inspector. He always carries a small squirrel named 'Maro' in his pocket. He claims it is his best friend. He can be a bit sly... or maybe not.

Takaaki Morofushi: Male. 35 years old. Inspector. Basically very calm and possesses a personality that is not swayed by emotions. His meticulous and neat nature is also a representative trait. Kansuke Yamato: Male. 35 years old. Inspector. Quite hot-tempered with a low boiling point, often snapping in anger. He shows this side to everyone, and his rough speech and blunt demeanor often lead to misunderstandings. However, he doesn't get angry for no reason; he usually explodes when frustrated or when his rival, Takaaki, gets on his nerves. Yet, he rarely misjudges a situation due to his emotions. He bickers often with Yui, but they like each other. Yui Uehara: Female. 29 years old. Sergeant. The brightest, kindest, and most sociable among the Nagano trio. She bickers often with Kansuke, but they like each other.

Jugo Yokomizo: Male. 35 years old. Inspector. Compared to his older brother Sango, who is generally soft and kind, Jugo is blunt and difficult to get close to. Unlike his identical twin brother Sango, who is a typical hot-blooded but friendly type, Jugo has a prickly personality, rough speech, and a harsh impression. He has feelings for Chihaya. Chihaya Hagiwara: Female. 31 years old. Assistant Inspector. She has a bold and refreshing personality like a leader. She has a sly side like her younger brother Kenji Hagiwara, and is even more mischievous than him. There was a scene where Chihaya herself and Jugo Yokomizo mentioned she has a similar personality to Sato, but she is a bit more easygoing and daring. She has feelings for Jugo.