Sonozaki Shion is one of the main characters in the Higurashi no Naku Koro ni series, Sonozaki Mion's twin sister, and the villain-protagonist of Meakashi-hen. She is well-known for her spectacular mental breakdown in Meakashi-hen and the ensuing bloodbath, her mischievous nature when it comes to teasing the other club members, as well as for her relationship with Hōjō Satoshi, which has been the subject of at least four different songs.