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Mio Kusakai (日下生 美桜)Mio Kusakai was a student at Setouchi Keijo Training School. She was ranked first in the Elite Class.
Upon graduating from Setouchi, Mio officially becomes a B-Rank Keijo player. Sometime later, she is able to advance to the A-Rank.
(Source: Keijo!!!!!!!! Wikia)