Yamainu (山狗, lit. Mountain Hounds. "Wild Dogs" Yen Press vers.) are a counter-intelligence force under the control of "Tokyo". Okonogi is the leader of the squad, although Takano can act as a commanding officer. 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. However, they betray her in the end when her schemes fail.
