 If you liked
Marugoto♥Anju Gakuen
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 ...then you might like
Oto x Maho
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The basic premise is as follows: Oto x Maho is about a boy who must transform into a magical girl or risk actually changing gender, while Marugoto Anjyu Gakuen is also about another boy who transfers to an all-girl school full of monsters.
Both series' protagonists are traps, they both must fulfill a certain condition, and both have girls falling for them despite their girlish demeanor.