Midori Kamitsuka

He is the son of Kanae, Mashiro's aunt and he's got a pet cow named Karubi. When the two of them were kids, Mashiro and him were good friends until Mashiro bumped into his sister's ceremony to become the new miko of the Kamitsuka family, which causes the ritual to fail. Seeing how she is no use to them anymore, the Kamitsukas abandon her and Midori blames Mashiro completely for it. From this day forth, he hates Mashiro and wants to kill her to avenge what she did to her sister.