" Kei Shirogane  "

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Kei is Miyuki's little sister who is the student council treasurer in the junior high school. Kaguya admires her because she is much like her brother as she is fairly serious; that being with her is like being with Miyuki.She is rebellious when it comes to interacting with her brother, finding him to be annoying and not fashionable, but still cares for him and ensures that he presents a good image when he is in front of her classmates. She is good friends with the Fujiwaras both her classmate Moeha, and Chika. Despite not interacting with Kaguya much, Kei tries to get to know Kaguya better and is happy when she makes little breakthroughs.