Shinichiro Kosaka is a detective of the major cases unit of the Tokyo Metropolitan Police and on the path to become captain of the unit when he makes a mistake during an investigation. Kosaka was subsequently demoted to precinct duty, where he finds his new colleagues taking on small cases tirelessly with a sense of justice untinged by workplace politics and internal disputes.

• Hiroki Hasegawa
• Katsumi Kiba
• Taro Suruga
• Yuu Kamio
• Masaki Okada
• Ken Yasuda
• Toru Tezuka
• Ryo Ryusei