 If you liked
Watashitachi no Shiawase na Jikan
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 ...then you might like
Diamond Dust
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I recommend this because they share a similiar atmosphere of sadness. They both involve a woman that's having hardships involving the piano, and a guy she's falling in love with. Both very well written
Both male and female main characters of these two manga have a difficulty of living of their lives. But when the two of them meet each other, their lives has slowly changed. And realize that they need each other in their lives. These two series are also related to music especially piano. Just read one of these two manga or both of them if you want to know why we must cherish this beautiful life....