 If you liked
Kimi ga Nozomu Eien
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 ...then you might like
Shingetsutan Tsukihime
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Although the stories and even tones of the two animes are completely different, they have a coule things in common; for one, they are both extremely dramatic and sad. Both also rely quite a lot on secrets and a moderate amount on betrayal and regret. The style of art in both is also not extremely cute, but definitely pretty. If you liked one, you will probably like the other.