 If you liked
Wind: A Breath of Heart (TV)
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 ...then you might like
KimiKiss Pure Rouge
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both series depicts the main protagonists as childhood friends that were separated for many years and reunited at the beginning of the series, and both nana aihara and hinata okano are both cheery, childish and energetic, and are both younger sisters to their onee-chans kazuki aihara and makoto okano