- Main characters
Tamura Masakazu as Furuhata Ninzaburo
Nishimura Masahiko as Imaizumi Shintaro
Ishii Masanori as Saionji Mamoru
This series is different from the past detective stories. The Lieutenant is collection of true mystery stories in which the detective, Ninzaburo Furuhata, must solve ingenious crimes and outwit elusive criminals. Although Ninzaburo Furuhata is a government officer, he does not wear a tie. Although he specializes in murder cases, he does not carry a gun. He does not use violence. More than anything, Ninzaburo Furuhata conducts himself as a gentleman, and uncovers the tricks which outwitting genius criminals play by cool reasoning and smooth talking. In every episode, Ninzaburo Furuhata will introduce a different criminal in his memory, and share his experience tracking and interacting with these criminals.