One of the main characters of the Idolmaster series.
A cool and serious 15-year-old music enthusiast. While naturally talented, Chihaya is less enthusiastic about the "idol" aspect of her career, preferring classical music, and is actually rather awkward with other people. Well-known for her occasional insecurity regarding her rather flat chest.
Her mother is Kisaragi Chigusa. She also has a deceased younger brother, Kisaragi Yuu.
Chihaya's theme color is blue, and is voiced by Imai Asami.
In Idolmaster Xenoglossia she is voiced by Shimizu Kaori.