Saeki Chisato is a character who first appears in Onisarashi-hen. She's a friend and classmate of Kimiyoshi Natsumi and Makimura Tamako. In Onisarashi-hen and Someutsushi-hen she is the one who introduces Natsumi to Tōdō Akira. In Someutsushi-hen she develops a crush on Akira and in the end Natsumi assaults her badly.
(Source: Higurashi No Naku Koro Ni Wiki)
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