Yukimi Chiaki

She is a third-year student at Rinin Academy.
Her parents died in an accident two years ago, and she now lives with her younger brother. She was originally from a wealthy family and thanks to her parents' insurance money, she is not in financial trouble.
Her father, Takayuki Yukimi, is Toshio Katsuragi's older brother, and Katsuragi and his wife sometimes invite them over for dinner and take care of them.
She is not at all unsympathetic toward his younger brother, who is her only living close relative after the death of his parents, but she avoids him at school because she is worried that her classmates will see his otaku-like appearance.
She is a member of a group of close childhood friends.