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Ako Atarashi is a first-year student at Achiga Girls' Academy. When she was in elementary school, she went to the same Mahjong class as Shizuno Takakamo and Nodoka Haramura. In middle school, she went to a different school than the other two, and they joined their respective Mahjong Clubs. However, to attend the same high school as Shizuno and to meet Nodoka again, she entered Achiga Girls' Academy. She is intelligent and good with calculations.