 If you liked
D.Gray-man
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 ...then you might like
Hungry Joker
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In this series, the protagonist is somewhat related to the antagonist. There is the existence of good and evil organization that continues to oppose each other due to its ideals. They both hunt for the special items which provide them abilities and of course its compatible owner. If you want to read a story that is quite similar to D.Dray-man, then it doesn't hurt if you try this manga.