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Arisu Sakayanagi (坂柳 有栖)Age: 16
Birthday: March 12
Height: 150 cm
She appears to possess a "go with the flow" attitude as she accepts most situations with no protest though she voices her dislike of boring situations after Katsuragi noted of the class scores. Unlike Kouhei Katsuragi, who has a conservative stance, Arisu possesses an innovative attitude. Together, the pair effectively lead class A through the school years.
(Source: You-Zitsu Wikia)