 If you liked
Wind: A Breath of Heart (TV)
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 ...then you might like
Lamune
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both series featured the main male and female protagonists as childhood friends plus both male protagonists Kenji Tomosaka and Makoto Okano have comical male partners Tsutomu Tachibana and Hatano, and Both Series' Main Protagonists have one of the female protagonists as a Sister(Makoto and hinata Okano and Kenji and Suzuka Tomosaka; both of the protagonist's younger sisters even calls the female protagonists as onii-chan or the japanese way of addressing an older sister or female), and also the male leads, their sisters and the female leads are all friends with each other