If you liked
Empty Heart: Itsuwari no Koi Dakara
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...then you might like
Rin!
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Both stories revolve around the main character falling in love with his elder brother's best friend. However, Empty Heart contains more angst, since the elder brother's best friend is in love with the elder brother to begin with; Rin! is a little more light-hearted, being more oriented towards the main pair innocently discovering how much they mean to each other.