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Ayaka is a 3rd year student in the Final Course. As she is the older sister to Ritsuko and overall trouble-maker, all of Vincennes knows her. However, her prankser nature has isolated her from the majority of the school who generally give her the cold shoulder. 

Although her preferences lie on the side of reform, she is generally unmotivated by the fact that she will be graduating this year. She's very interested in the protagonist, though, and often teases him as a way of getting closer. Ritsuko lectures her from time to time, and although she brushes them off, Ayaka deeply cares about her younger sister.