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A member of the student council. Haruka is rather hot-headed and loudmouthed, but firmly believes in what is right and does what she can for the betterment of the school.
She is extremely jealous of Fujino Shizuru and constantly tries to overshadow her or prove that she is an incompetent leader (this usually backfires). An ongoing gag is that Haruka uses words and phrases incorrectly all the time; Yukino constantly has to correct her. She and Yukino have been friends for a long time, and Yukino greatly admires and looks up to Haruka, who acts like her protector.