 If you liked
Nurarihyon no Mago
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 ...then you might like
Kamisama Hajimemashita
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Both of these manga have youkai.It has some of the some youkai, though Nuraihyon no mago has much more. Kamisama Hajimemashita focuses more on romance with a hint of action,whereas Nurarihyon no Mago is the opposite. If you like supernatural I recommend either of these.