 If you liked
Romeo no Aoi Sora
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 ...then you might like
Little Busters!
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one of the main themes of both shows is friendship and it's so strong that in both, the name of group is the name of the anime (well for Romeo, it's just book/English title)
While this is more prominent in Little Busters Refrain, each arc of both, even if have problems with their dramatic events, at the end they just have amazing payoffs
The OST in both anime are very good and makes the emotional scenes more impactful