 If you liked
Kimi ga Nozomu Eien
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 ...then you might like
Les Misérables: Shoujo Cosette
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Not that the genre or target audience is similar.
Actually, although Les Miserables was made for kid's theater, I think it's indeed too heavy for the kids to understand the stress & strains.
Anyway, if you are looking for melodramas which can drive your mood down low, to an extent which make you having difficulty to continue, Les Miserables first season & Kiminozo are good choices.
Kimi ga nozomu Eien - romance & trauma victim & "Bizarre Love Triangle"
Shoujo Cosette - the most unlucky girl (?), poverty & unfair society in the past