 If you liked
Kekkaishi
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 ...then you might like
Nurarihyon no Mago: Sennen Makyou
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Both anime have something to do with supernatural beings, they both eliminate demons and ghost both main characters are incarnation of the greatest evil, well one is, the other is the son of the greatest evil. Their life style is also similar, both act casual in the morning, chat to friends, school work, etc. But when night comes they both become a totally different person