 If you liked
Kure-nai
|
 ...then you might like
Nabari no Ou
|
Both series are about a secret world that coexists within the "normal" world we know without people knowing about it, and a relatively defenseless kid from one world who's drawn into the other, being protected by a group of skilled guardians as they learn the ropes and get their bearings. The primary different in premise is that Nabari no Ou has a seemingly average boy drawn into the ninja world, while Kure-nai has a girl rescued from her own household's harmful customs and intentions and brought into the "real" world.
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Recommended by lithiumflower