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Mizuki Hayama (羽山 ミズキ)Mizuki goes to an affiliated school and admires Kei greatly as someone who is older than her; in fact, Mizuki is also on her school's girl's basketball team. She greatly enjoys reading shōjo manga. She has a straightforward attitude and likes to be frank towards others, especially to Kei.
She's the main heroine of the fourth chapter from the ''Ef'' series: Ef -The latter tale-.