 If you liked
Black Bird
|
 ...then you might like
Mitsuyokon: Tsukumogami no Yomegoryou
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They have similar genres (supernatural, romance, smut, drama)
A normal girl who can see spirits has promised a mysterious man to be his bride, when she was small
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Recommended by Sakura_moe
Both contain heroines who can see otherworldly creatures that normal people can't, and both get involved romantically with a high-ranking being of that other world.
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Recommended by shikanomnom