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Oshimizu Nako is a 16-year-old cleaning maid and waitress working part-time at Kissuiso. She has a shy and timid personality but started working at Kissuiso because she wanted to change her personality. She is, however, confident about her swimming ability, which she started when she was only three. She was nicknamed Kappappa after Kappa for her skill at swimming. Nako and Minko are close friends. She is in the same high school as Ohana, Minko, and Yuina.

Source from Wikipeida