 If you liked
I ♥ HS
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 ...then you might like
Ao Haru Ride
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this manga is similar to Ao Haru Ride, in a few ways.
1) it has beautiful art.
2) the story, its essentially the same (the girl and the guy have a budding romance until he leaves abruptly.)
3) he returns and after a while & they find themselves drawn to each other.
4) its about friends, Ao Haru Ride is not only about Futaba but also the other people around her (classmates), I ♥ HS also has active side characters.
5) they're both are comedy school life shoujos.