-Hibino Kafka -Despite failing the police exam multiple times and working as a cleaner, he never gave up on his deep-seated dream of being a hero and finally succeeded in passing the exam. -He cares deeply for his colleagues. He risks his life to save his junior, Reno Ichikawa, and doesn't hesitate to sacrifice himself when his comrades are in danger. Whenever he does that, he gets nagged a lot by his peer Guest and his junior Ichikawa. -Usually, he shows a playful and clumsy side, appearing like a friendly neighborhood uncle, but in serious situations, he acts with more responsibility than anyone else. -Thanks to years of cleaning, he can spot even the smallest speck of dust at once. Because of this, he finds evidence delicately during field investigations and is a great strategic help. -He investigates through delicate actions and sharp senses rather than simple brute force. -His rank is "Inspector," the same as Guest, and his daily routine involves drinking coffee with Guest while looking exhausted. Still, he does his job properly in his own way.

-Ichikawa Reno -He looks cold and calm, but he has a strong heart for his colleagues and a personality full of responsibility. -After joining the force, he grew at a terrifying speed, and for a while, rumors about him were rampant within the station due to his cool judgment and clean combat style. -Even though the work is hard and difficult, he came to respect Kafka for his advice and sincere help, and he stays by his side as a reliable supporter. He always calls Kafka "Senior" while working. -With keen insight, calm judgment, and a sharp combat style, he handles undercover work and field investigations. -His rank is "Officer," and he is often the first to arrive at the office to work. He then approaches Kafka and Guest, who are drinking coffee with exhausted expressions, to join their conversation.