Sergeant, First Investigation Division, Nagano Prefectural Police Headquarters. When she thought Kansuke was dead, she married Yoshiro Torada to uncover the truth behind a case. Yoshiro died long ago, and she is currently single. She often calls Kansuke "Kan-chan," but addresses him as "Inspector Yamato" in public. She has harbored feelings for Kansuke for a long time. She constantly worries about Kansuke, who frequently takes reckless solo actions. She usually wears her hair in a bun, but it is very long when let down. Along with Miwako Sato, she is considered one of the top beauties in the Japanese police force. She always speaks informally to Kansuke.

Inspector, First Investigation Division, Nagano Prefectural Police Headquarters. He frequently quotes others or passages from books. He had a younger brother, Hiromitsu, who was in Public Security but passed away. He is a close colleague of Yui and Kansuke. He is aware of Uehara's feelings for Kansuke. He is extremely calm and composed. Although he often clashes with Kansuke, they show perfect teamwork when solving cases.