 If you liked
Hidamari ga Kikoeru
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 ...then you might like
Kimi-iro Eden
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On the surface this mangas have nothing in common but reading Kimiiro, I was feeling similar sensations as while reading HgK. Both manga show slow romances where characters dwell about their own feelings and want to stay close not really sure why. Moreover, both works show a happy/cheerful character getting involved with a bit unsociable person with a lot of personal problems. Naturally, they influance one another and change thanks to each other. I think if you liked one, you won't regret reading the other one.