 If you liked
Astarotte no Omocha!
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 ...then you might like
Sengoku Otome: Momoiro Paradox
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Similarities:
Both main leads (the muchacho from AO and chica from SO) are unwilling people who by some strange chance were drag into another world.
Both main leads have no idea what they are in for.
Both main leads have no idea that they are getting into someone's nerves.
Both has some degree of ecchi in it.
Both genre have fantasy and fairytale in it.
Dissimilarities:
The main lead in AO is a full Otoko, while in SO, the main lead is an Onna.
One has some degree of tragedy kind of genre, while the other has a twisted genre form of history in it.