Yamainu

(Modified for Higurashi wiki) The Yamainu (lit. "Mountain Hounds") are a counter-intelligence force under the control of the "Tokyo conspiracy", a conspiracy to weaponize the Hinamizawa virus. Though they are initially there to protect Furude Rika (under codename 'R') and those working at the Irie Clinic, they are bribed by Takano Miyo to help her carry out her plan to destroy Hinamizawa.