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Akihisa's twenty-three year old sister. She has a Harvard education, E-Cup breasts and a sexual infatuation with her brother.
In the anime, Akira comes back from Amarica to check up on her brother, who has been living alone in Japan. She also serves as a judge as to whether or not Akihisa is worthy of living alone. She does so by deducting "points" for things that she deems unacceptable,which includes sexual indecency (towards anyone but Akira) and amount of time spent on video games.