 If you liked
Watashitachi no Shiawase na Jikan
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 ...then you might like
Magi no Okurimono
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Both are incredibly somber and bittersweet romance stories that deal with love, although they do it in very different ways. Magi no Okurimono uses the supernatural slightly to aid it in its story, but is ultimately less melodramatic than Shiawase na Jikan (not to say that it's bad, of course). If you liked the tone of Watashitachi no Shiawase na Jikan, you would do good to read Magi no Okurimono. The length is about the same, as well, and the mangaka can also pack a moving story in its volume.