 If you liked
Yu☆Gi☆Oh!
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 ...then you might like
Juunikyuu de Tsukamaete
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Dual identity themes,dealing justice to bad guys as well as lot of supernatural shit in it as well too and nice to look at art and interesting character designs.
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Recommended by Disapeared_Ghost
Yu-Gi-Oh and Zodiac P.I. are two fantasy action manga with a main character who has an alter ego, a childhood friend who gets dangerously close to finding out about said identity early on, and uses a mystical item related to real world concepts/cultures—YGO with Egyptian mythology and Zodiac with the Western zodiac. The latter is more on the mystery and romantic side than the former, but both give off a similar fun vibe where it's satisfying to see criminals get caught and punished for their actions (for YGO this is mainly in first 7 vols).