 If you liked
Tonari no Megane-kun.
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 ...then you might like
Fushigi no Maria-kun
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In both mangas, two childhood friends that have been together for a long time realize their true feelings and develop a further relationship. Both mangas have the male childhood friend popular, and the female being quite caring and protective for the guy. Both also show their relationship developing. If you've liked one, you'll probably like the other.