Priest of Darkness - Season 1

Kōchiyama Sōshun serves as a cha-bōzu (He is kind of tea man) in the administrative headquarters of the Tokugawa shogunate but he works behind the scene to protect powerless people from evil power of Tokugawa shogunate. Kataoka Naojirō and Ushimatsu work for Kōchiyama. Kaneko Ichinojō is a ronin whose interests often align with Kōchiyama