 If you liked
Matantei Loki
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 ...then you might like
MeruPuri: Märchen☆Prince
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Matantei Loki is a shounen while Merupuri is a shoujo, they have totally different plots but there are some similarities like the main guys were both cursed. In Merupuri, Aram was cursed to transform in an adult, while Loki was cursed to transform in a child. In both mangas, the main girls are teenage girls who have romantic feelings for the main guys.