If you liked
Kiniro no Corda: Primo Passo
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...then you might like
Shugo Chara!
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Both shows have fairy-like characters that help the main character(s) achieve something.
If you liked
Never Give Up!
|
...then you might like
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Both are about a person who dresses up as the opposite gender and models.
If you liked
Otona ni Nuts
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...then you might like
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Both girls use something to become older to be with the person they love. In Instant Teen, she gets the magical nuts. In I Can't Tell Anyone, she uses a time machine. Though, I Can't Tell Anyone is aimed at a much more mature audience than Instant Teen.
If you liked
Ai wo Utau yori Ore ni Oborero!
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...then you might like
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Same mangaka.
If you liked
Dennou Shoujo☆Mink
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...then you might like
Otona ni Nuts
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Both involve a girl having a secret identity thanks to something that they didn't mean to find. (In Otona Ni Nuts, she finds the magic nuts. In Mink, she finds the discs.) They also cannot tell anyone who they really are.
If you liked
Full Moon wo Sagashite
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...then you might like
Otona ni Nuts
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Both involve a girl becoming older to do something that she wants to do. Both also have to keep that ability a secret.