 If you liked
Im
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 ...then you might like
Jibaku Shounen Hanako-kun
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they have the same feeling?
As in:
- a 15 year old girl meets a super natural boy of similar age
- the girl is cursed in some way
- an exorcist type rival with a relation to family
Im and Toilet bound's hanako kun are both mangas talking about country's folklore about the ancient egyptian religion, gods and myths for Im, and the shinto religion and Japan's myths and scary stories. Both are taking place in a modern environment involving spirit boys who will guide a girl through their adventures.
If you like mythology and world's cultures, you will definitely enjoy both of them!