Shirakawa, Koyomi

白河暦

Koyomi serves as Jun'ichi's homeroom teacher and is one of the science instructors on the faculty. She is also Kotori's older sister. Additionally, she works as a researcher at the Amakase Laboratory, where she is in charge of the Miharu android. In the Second Season, she is a new mother, and her strict composure rapidly crumbles when she talks about her baby.