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Yukino is the leader of the Service Club, of which she is the sole member until Hachiman joins her. She is smart, beautiful, and is nicknamed the "Ice-cold Beauty" for her icy demeanor. She has a twisted sense of "noblesse oblige", and believes that it is the duty of the exceptional (in other words, herself) to help the "lost lambs" of the world. Her personality often leads her to be disgusted at the naivete of others, particularly Yui's, and she does not hesitate to show it.

Despite this, Yui still affectionally calls her "Yukinon." She is a student of Class 2J (The academic standards of Class J are 2 to 3 points higher than the regular classes on the bell curve.)

It was later revealed that her father is a member of the National Diet (a legislator in Japan's parliament). Yukino was in the car that hit Hachiman.