
The Yagami Detective Agency is a detective agency headquartered on Nakamichi Street in Kabukicho, Tokyo. The agency was founded by former lawyer Takayuki Yagami in 2015 after Shinpei Okubo's alleged murder of Emi Terasawa caused Yagami to doubt his capacity to determine right from wrong, and he employed his ex-yakuza friend Masaharu Kaito. Yagami often fell behind on rent due to lacking work, but the kindness of his landlady Rie Tomioka was often the sole reason he was not evicted. In 2018, his career recovered after he investigated the AD-9 conspiracy, and, in 2022, he uncovered Vice-Minister for Health Reiko Kusumoto's solicitation of murder.