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A calm, collected, and often lazy high school student.
HistoryAyumu was born in Wakayama, lived in Kobe for elementary school, went to middle school in Osaka, and eventually transferred to Tokyo, where Azumanga Daioh takes place. The students expect her to be a "typical Osakan," i.e. loud and obnoxious, but she is in fact very quiet and a total space cadet. Since she is most recently from Osaka, her classmates nickname her "Osaka," and the name sticks so badly that even her teacher calls her that during roll call.
PersonalitySlow and spacey, Osaka reacts to the world in a childlike manner unfettered by common sense. She has a habit of commenting on obvious facts unnoticed by her companions-- such as their group's lack of boyfriends --and is rarely hyper or manic like most of her companions.