 If you liked
Akatsuki no Yona OVA
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 ...then you might like
Sayonara no Asa ni Yakusoku no Hana wo Kazarou
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People who do not age, who do not die. And yet, everyone around them does. This premise is explored in the Yona OVA (hot springs episode notwithstanding) and SayoAsa, where immortal beings form an intimate relationship with a normal, mortal person. The way in which it is handled in both works are a bit different, but they invoke a similar flavor of bittersweetness.