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Haruka Nogizaka (乃木坂春香)Birthday: October 20th
Blood Type: A
Haruka is the female main character, and is Yūto's classmate. She is idolized at school due to her beauty and intelligence, and is regarded as the school's most unattainable girl. In fact, at school she is known by the French nicknames "Nuit Étoilée" (The Silver Star of the Night) and "Lumière du Clavier" (The Shining Princess on the Piano). She is very skilled at playing the piano and has taken overall victories in international contests. She also has a gentle personality, is a natural airhead, and is quite clumsy. Her deep hidden secret is that she is a major otaku and loves anime and manga. In middle school, her secret was exposed and she received a certain amount of prejudice towards it which caused her to keep it a secret once she entered high school. When Yūto finds out about it, Haruka is relieved that he does not tell anyone or harass her about it. She also comes from a rich family and privileged upbringing, so her interest in the otaku subculture is looked down upon due to her status in society, which is another reason why she keeps it a secret.
Oreimo, short for Ore no Imōto ga Konna ni Kawaii Wake ga Nai, complicates a simple brother-sister relationship. Kyousuke is a normal older brother just being brotherly to his little overachieving sister, who happens to secretly be an otaku. But... is that really all there is to these two siblings?