 If you liked
Kareshi Kanojo no Jijou
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 ...then you might like
Sakamichi no Apollon
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Main characters in high school where they find themselves and really build friendships and bonds. Time skip at the end where you get to see how everyone turns out. The vibe really is similar where you watch the characters grow and change into something. After reading both of these, I get a feeling of nostalgia that's unique to both of them