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|Da Capo, Da Capo: If Character|
|Family|| Kotori Shirakawa (sister),
|Anime Debut||Can't I Fall In Love?|
Koyomi Shirakawa (白河 暦 Shirakawa Koyomi ) is Jun'ichi's homeroom teacher, one of the faculty's science teachers, and Kotori's older sister. She is also a researcher at the Amakase Laboratory, and in charge of the Miharu android.